restapi : name is invalid argument segment error when adding tag with parent id(#950450)

add tag --name newtag --parent-name ooo2

Results in error: "name" is invalid argument segment.

the command should be

add tag --name newtag --parent-tag-name ooo2

Change-Id: I904888aa9cadb8cfcf9f7119f1bc4ac301cee7f9
Bug-Url: https://bugzilla.redhat.com/950450
Signed-off-by: Ravi Nori <rnori@redhat.com>