Move test_ovs_lib to tests/unit/agent/linux

Fixes bug 1295846

Change-Id: Ifd3576e9b549361a4baf9cfc2b9301bb45789474
Fix function parsing the kernel version

Change-Id: Id56efb476144a18cd9eb7279bc0f602760a86173
Closes-Bug: #1300808
Merge "Fix function parsing the kernel version"
Merge "Move test_ovs_lib to tests/unit/agent/linux"