tests: pre-commit regression tests

Framework for writing test cases to be submitted with patches.

This framework and the test cases get exercised by Jenkins in
the pre-commit regression test. Jenkins is configured to give
a +1 verified vote only if the regression test passes without
failures (which includes test cases added/changed by the patch
being tested)

Every patch should include a test case (either extensions/changes
to existing test cases or add new ones, as appropriate). The test
case should be part of the same commit so that both code and
test case get reviewed together.

Test cases added are cumulative. Every new patch gets
tested against its own test case and every test case previously
added.

A lot of new commits in the near future will be pure test cases
(with no code change) which will get added in "catch up" mode.

The tool used for implementing test cases is 'prove', and the
framework itself is modeled similar to the POSIX compliance
filesystem test suite.

Under the top level directory, a new directory named 'tests/'
is added. This contains top level classifier directories and
framework files/scripts.

Functionality tests should be created under a classifier directory
below 'tests/'. For e.g:

  tests/basic/mount.t
  tests/performance/write-behind.t

Bugs which get fixed should include a test case script named
by the bug id, so that we are guaranteed any new change will
not bring the issue back. For e.g:

  tests/bugs/bug-123456.t

Triggering of regression tests in Jenkins is manual at this point
as we do not want the entire test suite to run against every
revision of a patch while it is still in the review/resubmit cycle.

Signed-off-by: Anand Avati <avati@redhat.com>

Change-Id: I8078244619135ccaba38e068925f8ca85141055a
BUG: 764966
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/4101
Tested-by: Gluster Build System <jenkins@build.gluster.com>

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