Disable l10nupdate for the duration of CLDR 26 plural migration

Planned for from 2014-10-27 to 2014-11-06 to prevent grammar
mistakes appearing in the user interface.

Bug: 62861
Change-Id: I11e74e3b4d7e4870912a02c182d78d236bbb1916
Merge "Disable l10nupdate for the duration of CLDR 26 plural migration" into production