This seem to be related to the git package.
I will update the description.

** Summary changed:

- Unable to fetch git repos using autotest framework with git 2.17.0-1ubuntu1
+ Unable to fetch git repos via python subprocess with git 2.17.0-1ubuntu1

** Summary changed:

- Unable to fetch git repos via python subprocess with git 2.17.0-1ubuntu1
+ Unable to fetch git repos via python subprocess with proxy configured git 
2.17.0-1ubuntu1

** Description changed:

  All the tests that need to fetch a git repo for testing failed with error 
message like:
      CmdError: Command <git clone https://github.com/tytso/xfstests-bld> 
failed, rc=128, Command returned non-zero exit status
      * Command:
          git clone https://github.com/tytso/xfstests-bld
      Exit status: 128
      Duration: 0.254368066788
  
      stderr:
      Cloning into 'xfstests-bld'...
      fatal: unable to access 'https://github.com/tytso/xfstests-bld/': 
gnutls_handshake() failed: An unexpected TLS packet was received.
  
  Step to reproduce:
-   1. Deploy a Bionic system and install the python-minimal package
-   2. git clone --depth=1 git://kernel.ubuntu.com/ubuntu/autotest
-   3. Run the following python code:
-  from autotest.client import test, utils
-  import os
+   1. Deploy a Bionic system and install the python-minimal package
+   2. Run the following python code:
+  import subprocess
+  import os
  
-  proxysets = [{'addr': 'squid.internal', 'desc': 'Running in the Canonical CI 
environment'},
-               {'addr': '91.189.89.216', 'desc': 'Running in the Canonical 
enablement environment'},
-               {'addr': '10.245.64.1', 'desc': 'Running in the Canonical 
enablement environment'}]
+  proxysets = [{'addr': 'squid.internal', 'desc': 'Running in the Canonical CI 
environment'},
+               {'addr': '91.189.89.216', 'desc': 'Running in the Canonical 
enablement environment'},
+               {'addr': '10.245.64.1', 'desc': 'Running in the Canonical 
enablement environment'}]
  for proxy in proxysets:
-         cmd = 'nc -w 2 ' + proxy['addr'] + ' 3128'
-         try:
-             utils.system_output(cmd, retain_output=False)
-             print proxy['desc']
-             os.environ['http_proxy'] = 'http://' + proxy['addr'] + ':3128'
-             os.environ['https_proxy'] = 'https://' + proxy['addr'] + ':3128'
-             break
-         except:
-             pass
+         cmd = ['nc', '-w' ,'2', proxy['addr'], '3128']
+         try:
+             subprocess.check_call(cmd)
+             print proxy['desc']
+             os.environ['https_proxy'] = 'https://' + proxy['addr'] + ':3128'
+             break
+         except:
+             pass
  
-  utils.system('git clone https://github.com/tytso/xfstests-bld')
-    4. Update the git package from 2.15.1-1ubuntu2 to 2.17.0-1ubuntu1
-    5. Remove the xfstests-bld dir and try step 3 again
+  subprocess.check_call(['git', 'clone', 
'https://github.com/tytso/xfstests-bld'])
+    4. Update the git package from 2.15.1-1ubuntu2 to 2.17.0-1ubuntu1
+    5. Remove the xfstests-bld dir and try step 3 again
  
  Result:
-   * Step 1 - 3 with git 2.15.1 will work, but you will see the error message 
with git updated to 2.17.0
- 
+   * Step 1 - 3 with git 2.15.1 will work, but you will see the error message 
with git updated to 2.17.0 (this code works without proxy configured)
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-15-generic 4.15.0-15.16
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 
2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  CurrentDmesg:
  
  Date: Tue Apr 10 11:35:24 2018
  HibernationDevice: RESUME=UUID=e2735dd1-cbbc-4424-9c25-d37d073d9414
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:
  
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=38f7d570-2973-4055-b668-12a9ace1e0c7 
crashkernel=196M BOOT_IMAGE=0
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-15-generic N/A
   linux-backports-modules-4.15.0-15-generic  N/A
   linux-firmware                             1.173
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1762709

Title:
  Unable to fetch git repos via python subprocess with proxy configured
  git 2.17.0-1ubuntu1

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