Fix typo in keystone

1. Validate the user and tenant auth into in order to -> Validate the user
   and tenant auth info in order to
2. attmepting -> attempting
3. extnsion -> extension
4. identfier -> identifier
5. establed -> established
6. specifc -> specific
7. intitalized -> initialized
8. explicity -> explicitly
9. uniq -> unique

Change-Id: I8f4420e7c41cfdbc3f4751ed1c0b9a6e151b0940
Closes-Bug: #1254585
Merge "Fix typo in keystone"