Use a black regex file for tempest test

Use a black regex file for tempest test

previously we knew that mitaka ostestr did not allow the --black-regex
option and newton does. But, mitaka and newton (assuming future
releases too) allow a black regex file.

this patch also addresses one small refactor request to move a
copy utility to the  more logical SSHKeywords library.

Change-Id: I9d9c350a5eb6f0dad6693f36683031df7b2e6515
Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>