convert ':' to '-' in imagestream and imagestream tag names
convert ':' to '-' in imagestream and imagestream tag names

openshift doesn't allow ':' in imagestream name,
and there should be just one ':' in imagestream tag name which separates
tag from imagstream, so in case source registry is IP:PORT, we will
convert it to IP-PORT

* CLOUDBLD-746

Signed-off-by: Robert Cerven <32de7a518694880140ad479fa3724b97728d8e88@redhat.com>

projectatomic/osbs-client,projectatomic/osbs-client