Completes unittest coverage of quantum.api.api_common

Fixes bug #1102245

Change-Id: I01c8a563440f56db19d33a743549d2d50f5b48ee
Fix i18n messages in quantum.api.api_common

Change-Id: I30dc9ad76dbfb6cc038c283d81e449cf64d7ffec
Remove redudant code

Fixes bug 1102402

Change-Id: Ib4a226cdc18506c1aa08707cc06fa76d4090287f
Enforces generic sqlalchemy types in migrations.

Fixes bug 1102491

Modifies the service_type migration to use sqlalchemy types instead of
mysql types. Also removes the import of mysql from several of the
migrations.

Change-Id: I0495a711cd14f64ced4d32857e30586a42b83839
Merge "Enforces generic sqlalchemy types in migrations."
Merge "Completes unittest coverage of quantum.api.api_common"
Merge "Fix i18n messages in quantum.api.api_common"