Ambiguous option error should not appear if Arg is SUPPRESS

Due to backward compatibility there are arguments hidden.
For example:

--tenant-id and --tenant_id

On those case the abbreviation mechanism if a user enter
--tenant throw that there is an ambiguity but the helps only
show --tenant-id as an optional argument.
This change remove this ambiguity if one of them is hidden.

Change-Id: I413f1ebafc68b3e02b5abadce1608e6d48207b01
Closes-Bug: #1252457
Update help strings for cinder client

Make text consistent and clear.
Add periods to end of sentences.
Adjust test suite for change

Closes-Bug: #1275881

Change-Id: I1dfde51636e8dc4b42e4c4810c27c1c4ac513d82
Merge "Ambiguous option error should not appear if Arg is SUPPRESS"