Commands are "ec2 credentials delete", "service delete", "endpoint delete".
Also update their unit tests and functional tests.
Partial-Bug: #1592906
Change-Id: I1a0b7160b803a523646d09d030e6f112c81c4c24
Migrate 'change', 'update' to 'modify',
migrate 'user to delete' to 'user(s) to delete',
migrate '(name or ID)' to '(type, name or ID)'.
Change-Id: Ie425e178bb5ddf773e6e793fcd91c78e9c4a5053
Changes to the 'service list' commands for Identity v2 and v3:
* Document support for --long
* Add Description to v3 output with --long
* v3 output is now (ID, Name, Type), with (Description, Enabled) added with --long
* Change v2 output to match v3 output, with the absense of Enabled.
* Update doc to match
Closes-Bug: #1411337
Change-Id: I999e3df22f61350cdeba63bbb7d01145c2ffeeaf
