Update i18n translation for Nuage plugin

Ensure that the LOG hacking rules are enforced on the nuage plugin
directory.

Change-Id: I0a415dfdf81ad337eda0dc8b618b6125b938a1eb
Update i18n translation for Metaplugin 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
metaplugin directory.

Change-Id: I34437019fc8ffc38f11114d1d83dce54170ab989
Partial-Bug: #1320867
Fix enable_metadata_network flag

The following patch: 9569b2fe broke the desired functionality of
the enable_metadata_network flag, by not allowing the metadata
proxy to be spawn for 'metadata networks', which are used for
accessing the metadata service when the logical router is not
implemented through the l3 agent.

This patch enables spawning of the metadata proxy for metadata
networks when the appropriate flag is set to True.

The patch also adds rather pedant unit test coverage for the
should_enable_metadata method which previously had no unit test.

Change-Id: I8dca1fce9fbc83e75ba7e4ce948531427bf7e88b
Closes-bug: 1394020
Merge "Update i18n translation for Metaplugin plugin"
Merge "Update i18n translation for Nuage plugin"
Merge "Fix enable_metadata_network flag"