Wrong key router.interface reported by ceilometer

Ceilometer with MongoDB doesn't accept the key with dot.

The dot in 'router.interface' should be replaced with '_',
which is also the standard implementation of other keys in neutron.

Change-Id: If7fcf7658db9ee2d7d1248bb0b016b4389c32c77
Closes-Bug: #1310460
Synced jsonutils from oslo-incubator

The sync includes change that drastically enhances performance on Python
2.6 with fresh simplejson library installed.

The latest commit in oslo-incubator:
- 732bdb6297eb9de81667f7713ebcb1ccc2ee45a7

Change-Id: Ib3dc0b713ed90396919feba018772243b3b9c90f
Closes-Bug: 1314129
Imported Translations from Transifex

Change-Id: I7ac7de8fb1cea473df6059e9443df1418c800521
Merge "Wrong key router.interface reported by ceilometer"
Merge "Synced jsonutils from oslo-incubator"
Merge "Imported Translations from Transifex"