Add command line options for specyfying hostname and port of the Gerrit instance.

Just the minimal change required to allow use of the script with another
gerrit instance. The script if used as today should not change its
behavior and default to the original OpenStack hostname and port.

Signed-off-by: Matěj Cepl <mcepl@redhat.com>
Allow working with Unicode non-ASCII values in the gerrit data.

Signed-off-by: Matěj Cepl <mcepl@redhat.com>
Merge pull request #5 from mcepl/another_instance

Add command line options for specyfying hostname and port of the Gerrit instance