Like CentralAuth does in createLocalAccount.php. In large wiki clusters where
you want Echo on for some wikis and not others, but don't want to keep a list
of Echo wikis (say, you want to make it on by default), this makes it possible
to safely run the script even on wikis where Echo is not enabled, where it will
just do nothing.
See also Ibde4c0c1, I741d2485
Bug: T59375
Change-Id: I3537206fccb459eb80de9fd61d2213dfb525c5f0
Update the "processEchoEmailBatch" to allow sending all
notifications immediately even if configured to be
daily or weekly.
Change-Id: I6ebeea86708247700d1950e0f6471c7b3d1fecd2
