This fixes some errors and inconsistencies I found reviewing the
help strings:
* Capitalize help strings
* Add missing space between words (in multi-line strings)
* Improve wording
Change-Id: I2fb31ab4191c330146e31c1a9651115a6657769a
Implements token create subcommand which is an equivalent of keystone
token-get command. Original "wrap" parameter for keystone token-get is
not implemented yet due to cliff Bug #1269299
This is a part of: blueprint add-identity-token-support
Change-Id: I2255021c9d1f10f757686583b1ebe40b5f3a9ecb