Remove _delete_tokens function from federation controller

There was a TODO to delete tokens based on idps and mappings, but
since this will be done at the middleware level of keystoneclient
(bug 1291157 then there is no include this piece of code.

Change-Id: I0e198c2b7a05e283409aef25e1d7ab93247814fe
support conventional domain name with one or more dot

Formal domain name will have one or more dot within the name,
meantime, it's common for one company own several domains,
for example abc.com and abc.net. But currently keystone
multi-domain support only supports domain name without '.',
because the wrong way that get the domain name from domain
config file name.

Change-Id: I152cd3b513353e3d4c565e71c8755789d24e1a0e
Closes-Bug: 1257171
Fix create_region_with_id raise 500 Error bug

1. add sql.handle_conflicts wrapper in sql backend driver.
2. check duplicate region id in kvs backend driver.
3. add 2 test cases to check exception.Conflict when create duplicate id region.

Closes-Bug: #1283904

Change-Id: Icfc5edf661501a5c134f324a76824812dbda2760
Merge "Remove _delete_tokens function from federation controller"
Merge "support conventional domain name with one or more dot"
Merge "Fix create_region_with_id raise 500 Error bug"