tests: add vdscli.cannonizeHostPort unit tests

This patch adds tests to cannonizeHostPort as is.
Future patches will address the FIXMEs and the
quirks of the function, bulding on the safety
added by these test.

Change-Id: I26ff1ccb6b258c7adf7014fb9bc8c09cb3f32f1a
Signed-off-by: Francesco Romani <fromani@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/35270
Reviewed-by: Dan Kenigsberg <danken@redhat.com>