Check that all po/pot files are valid

Perform minimal checks on po and pot files so that no broken files can
get imported.

Change-Id: I328fc11c688c16737ae88984e4778483ce5db5ab
Co-Authored-By: Clark Boylan <clark.boylan@gmail.com>
Related-Bug: #1298645
Fix spelling error in conductor/manager

maintenance was misspelled maintanence.

Found during translation.

Change-Id: I3a65a11f6337f3273dba0c01b36a41c30997d5e2
Merge "Check that all po/pot files are valid"
Open Juno development

Bump preversion to 2014.2 to formally open Juno development.
The Icehouse release branch (milestone-proposed) will be cut
from the last commit before this one.

Change-Id: Ifa98e88c4c78ef904b79da57a47195344ff4b3fb
Merge "Fix spelling error in conductor/manager"
Handling validation in conductor consistently

Change where we do validation in change_node_power_state to follow
where we do it for do_node_deploy and vendor_passthrough. That
is, we perform validation synchronously before we spawn off a
thread to perform the longer running action.

Change-Id: Ic1f791bb5ef49c033e4baff8d3f6900091dbf332
Closes-bug: #1294676