manager: Make WaitEvent action respect eventfilters

A WaitEvent issued via an http session isn't respecting eventfilters defined
for the user. I just added a match_filter to the predicate that controls
astman_append.

Tested by: George Joseph
Review: https://reviewboard.asterisk.org/r/3958/
........

Merged revisions 422439 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@422440 65c4cc65-6c06-0410-ace0-fbb531ad65f3