Manager: Require read permission for SYSTEM in order to send FullyBooted

Review: https://reviewboard.asterisk.org/r/3969/
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Merged revisions 422584 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 422625 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@422626 f38db490-d61c-443f-a65b-d21fe96a405b