Replace admin@example.org with admin@localhost

Fuel configures account under Admin/Identity Panel/Users
with email address of admin@example.org.  To prevent
sending unwarranted messages to admin.org domain,
replacing that with admin@localhost.

Change-Id: I2cc13f64ce16ceb8913b328c9183ab91722c4c48
Closes-Bug: 1372336
Merge "Replace admin@example.org with admin@localhost"