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forceRenameUsers: Replace _ in database name with -

Description

forceRenameUsers: Replace _ in database name with -

Underscores (_) are not valid in usernames, and are normally replaced
with spaces. But those look funny to some people, so use dashes (-)
instead. Also canonicalize the username so we don't end up with invalid
usernames in the database.

Change-Id: I56e83a23e25f90358b18e51d2d3d9679e0158c55