Sometimes docker login fails, retry the operation to compensate. In
particular, this seems to happen when a previous Jenkins build was not
stopped properly.
TESTS
=========================
Run docker-login & host-docker-login Jenkins jobs with valid and invalid
passwords.
Story: 2010055
Task: 51129
Change-Id: Id1998da7ba1de7539349b0a8b3937524e614aa4d
Signed-off-by: Davlet Panech <davlet.panech@windriver.com>