Fix 'stdin: is not a tty'

Changes in Ib00295e tried to move the profile correction code to
/etc/profile.d/mediawiki-vagrant, but apparently that script isn't
sourced in the execution path taken by the root shell that Vagrant uses
to run Puppet commands.

Change-Id: I55c6b69bdc6d97cec2b652bd1424153970a75bd0
Merge "Fix 'stdin: is not a tty'"