Clear out service disabled reason on enable

When a service gets re-enabled, clear out the 'disabled_reason' column.

Fix bug 1197423.

Change-Id: I78c9e40c65e96fbc6eff0e3426cfd87b0810cd69
Document rate limiting is per process

Since rate limiting is is done in memory, it is per process.  Document
this to warn users.

DocImpact

Change-Id: I580a4081550019914f074c8b1abdf435f3f24ca1
Better start/stop handling for cells

This adds separate cells calls for start/stop compute API methods that
handles objects.  This starts to move us away from the generic
'run_compute_api_method' cells call.

Change-Id: Ib2b28f8446883d825876227f639561a69e8b3308
Imported Translations from Transifex

Change-Id: I3c6a4b1296b63422c96fd38dd3d60c458a692d43
Merge "Document rate limiting is per process"
Merge "Better start/stop handling for cells"
Merge "Imported Translations from Transifex"
Merge "Clear out service disabled reason on enable"