rename templated.TemplatedCatalog to templated.Catalog

This addresses a long standing TODO for consistency across catalog
drivers, making it more intuitive to switch drivers.

UpgradeImpact

Change-Id: I109513695e60867d1111795ab958a3cc4240e831
clean up keystone-manage man page

- wrap literals with double backticks so things render in RST
- replace triple line breaks with double line breaks for consistency
- replace 'REST api' with 'HTTP API' because 2x pedantic

Change-Id: Ib28d0cea06f81b32ef985dfa74333693ef32ae46
Merge "rename templated.TemplatedCatalog to templated.Catalog"
Merge "clean up keystone-manage man page"