Remove unneeded import
Remove unneeded import

this import forgot to get removed from
Ia7519ac4371a635f05ac69a3a4d0f4e6d2f04cad , removing it
in post-production.

We will need "enum" soon enough when we go to Python 3 only.

Change-Id: I28297c2ed9f87fd0841076b861b8eeb610754dc3

monetate/sqlalchemy,sqlalchemy/sqlalchemy,j5int/sqlalchemy,monetate/sqlalchemy,zzzeek/sqlalchemy,j5int/sqlalchemy