Fix I-frame retransmission quirks.
Revamped the I-frame retransmission queue to better comply with Q.921: Figure B.7/Q.921 (sheet 1 of 10) and Figure B.9/Q.921 (Sheet 5 of 5). The changes prevent retransmitting I-frames when the peer is busy (RNR) (Q.921 Section 5.6.5) and eliminate an unnecessary delay sending new I-frames after an I-frame retransmission. Related to JIRA LIBPRI-60 git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@2200 2fbb986a-6c06-0410-b554-c9c1f0a7f128
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