Fix broken i18n support

In notification and publisher.rpc module, there are some log messages
don't support i18n, this patch fixes them.

NOTE: rename unused variable from _ to n, because it will overshadow
global _ of gettext.

Change-Id: Ic703fe6536234f4d51a84f4a3b2e04049ec6f3b5
Closes-Bug: #1263711
requirements: drop netaddr

We don't use directly, so there is no need to require it.

Change-Id: I94bbe7fbcfe192ca355ad00a64e0720addc1bb10
Remove redundant meter (name,type,unit) tuples from Resource model

Fixes bug 1267162

Previously, a list of meter (name,type,unit) tuples with per-sample
cardinality was added to the Resource model by the storage driver
get_resource method.

However this potential huge and highly repetitive list was then
promptly discarded by the API layer, as the meter links in the API
Resource representation are populated via subsequent calls into
the storage driver get_meters method.

Now, we avoid the scaling issue by suppressing the creation of
this unused meter list.

Change-Id: I18dee7552836c724798ea1340e2e933c09d8a294
Merge "Remove redundant meter (name,type,unit) tuples from Resource model"
Merge "Fix broken i18n support"
Merge "requirements: drop netaddr"