Moves extension files to routes

This allows extensions to be loaded properly without interfering with
directories in trove/extensions that are loaded as python modules.

Change-Id: Iad1bdc9b7548c46b0e5b8694693b4456ac548f14
Implements: Blueprint fix-extensions-imports
Secure root password on restore from backup after root-enable

On the restore of an instance that has root enabled on it, we need
to ensure that we are correctly securing the root password so that
the password is not empty.

Fixes bug: 1211557

Change-Id: I6386b9e0573a39a6667504666556b918927abf76
Merge "Moves extension files to routes"
Merge "Secure root password on restore from backup after root-enable"
Merge branch 'master' of https://github.com/openstack/trove
Merge branch 'master' of github.com:cweidenkeller/trove