manager: The eventfilter= option now takes an extended regex.

In pre-trunk versions (...12) it accepts a basic regex, which is
confusing because all other regexes in asterisk are of the
extended kind.

Review: https://reviewboard.asterisk.org/r/3147/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@406618 f38db490-d61c-443f-a65b-d21fe96a405b