chan_dahdi: Fix segfault reloading chan_dahdi when round robin is used.

* Clear round_robin[] in dahdi_restart().

(closes issue ASTERISK-21847)
Reported by: Ivo Andonov
Patches:
      jira_asterisk_21847_v1.8.patch (license #5621) patch uploaded by rmudgett
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Merged revisions 393627 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 393628 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@393629 f38db490-d61c-443f-a65b-d21fe96a405b
Add BUGBUG note for ASTERISK-22009

git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@393631 f38db490-d61c-443f-a65b-d21fe96a405b
Revert accidental overcommit.

git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@393632 f38db490-d61c-443f-a65b-d21fe96a405b
Add BUGBUG note for ASTERISK-22009

git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@393633 f38db490-d61c-443f-a65b-d21fe96a405b