app_dial: Allow macro/gosub pre-bridge execution to occur on priorities

app_dial: Allow macro/gosub pre-bridge execution to occur on priorities

The parsing for the destination of the macro/gosub uses the '^' character to
separate out context, extension, and priority. However, the logic for the
macro/gosub execution was written such that it would only do the actual
macro/gosub jump if a '^' character existed. This doesn't apply when the
macro/gosub jump occurs in a priority/priority label. This patch changes
the logic so that the parsing still occurs, but the jump will occur even
for priorities/priority labels.

(issue ASTERISK-23164)

Review: https://reviewboard.asterisk.org/r/3154
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Merged revisions 407041 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 407074 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 407082 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@407083 65c4cc65-6c06-0410-ace0-fbb531ad65f3