Adar Dembo has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/12474 )

Change subject: KUDU-1900: add loopback check and test
......................................................................

KUDU-1900: add loopback check and test

This change modifies Socket::IsLoopbackConnection to check
if remote IP is in 127.0.0.0/8 subnet. With this change
all connections from 127.0.0.0/8 are treated as local.

This change adds force_external_client_ip parameter to
AuthTokenIssuingTest. Before this change, AuthTokenIssuingTest
relied on Kudu treating connections between non-matching
addresses in 127.0.0.0/8 subnet as external. With this change,
the test forces Kudu client to use an non-loopback IP
address for test cases that verify external connections.
If an external IP address is not available, test cases that
require an external IP will be skipped.

For convenience, this change adds two static utility methods
(HostPort::IsLoopback and HostPort::AddrToString), and refactors
Sockaddr::host and Sockaddr::IsAnyLocalAddress to use these
static methods.

Change-Id: I3483a9729ddeeb7901e3738532a45b49e713208f
Reviewed-on: http://gerrit.cloudera.org:8080/12474
Reviewed-by: Adar Dembo <[email protected]>
Tested-by: Kudu Jenkins
---
M src/kudu/integration-tests/security-itest.cc
M src/kudu/util/net/net_util.cc
M src/kudu/util/net/net_util.h
M src/kudu/util/net/sockaddr.cc
M src/kudu/util/net/socket.cc
5 files changed, 163 insertions(+), 32 deletions(-)

Approvals:
  Adar Dembo: Looks good to me, approved
  Kudu Jenkins: Verified

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I3483a9729ddeeb7901e3738532a45b49e713208f
Gerrit-Change-Number: 12474
Gerrit-PatchSet: 16
Gerrit-Owner: Greg Solovyev <[email protected]>
Gerrit-Reviewer: Adar Dembo <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Greg Solovyev <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)

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