…agyar)

## What changes were proposed in this pull request?

The following error in the python code comes when there is an error during 
package install on ubuntu.

```text
2018-08-29 16:47:27,250 - Could not install packages. Error: global name 
'VERIFY_DEPENDENCY_CMD' is not defined
Traceback (most recent call last):
  File 
"/var/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py", line 
136, in actionexecute
    ret_code = self.install_packages(package_list)
  File 
"/var/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py", line 
447, in install_packages
    if not self.repo_mgr.verify_dependencies():
  File "/usr/lib/ambari-agent/lib/ambari_commons/repo_manager/apt_manager.py", 
line 218, in verify_dependencies
    err_msg = Logger.filter_text("Failed to verify package dependencies. 
Execution of '%s' returned %s. %s" % (VERIFY_DEPENDENCY_CMD, code, out))
NameError: global name 'VERIFY_DEPENDENCY_CMD' is not defined
Traceback (most recent call last):
  File 
"/var/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py", line 
136, in actionexecute
    ret_code = self.install_packages(package_list)
  File 
"/var/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py", line 
447, in install_packages
    if not self.repo_mgr.verify_dependencies():
  File "/usr/lib/ambari-agent/lib/ambari_commons/repo_manager/apt_manager.py", 
line 218, in verify_dependencies
    err_msg = Logger.filter_text("Failed to verify package dependencies. 
Execution of '%s' returned %s. %s" % (VERIFY_DEPENDENCY_CMD, code, out))
NameError: global name 'VERIFY_DEPENDENCY_CMD' is not defined

The above exception was the cause of the following exception:

Traceback (most recent call last):
  File 
"/var/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py", line 
486, in <module>
    InstallPackages().execute()
  File 
"/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", 
line 351, in execute
    method(env)
  File 
"/var/lib/ambari-agent/cache/custom_actions/scripts/install_packages.py", line 
149, in actionexecute
    raise Fail("Failed to distribute repositories/install packages")
resource_management.core.exceptions.Fail: Failed to distribute 
repositories/install packages
```

(Please fill in changes proposed in this fix)

## How was this patch tested?

- retried installation with the fix

[ Full content available at: https://github.com/apache/ambari/pull/2202 ]
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