Update i18n translation for Midonet plugin

All the existing LOG.info, LOG.warning, LOG.error and LOG.critical
messages should have _LI, _LW, _LE and _LC respectively. Also, debug
level log shouldn't be translated. This patch set will cover the midonet
directory.

Change-Id: Ic74316640015bc98ec4b2722f4039f58a9ec2379
Partial-Bug: #1320867
Merge "Update i18n translation for Midonet plugin"