Fix device call logging issues in skinny

Skinny device call logging (ie missed, place and received calls) has issues 
because the incorrect sequence of callstates is/can be sent to the device.
This patch removes some extra callstate updates driven by forces external
to skinny and ensures the needed intermediary callstate messages are sent.

(closes issue ASTERISK-20964)
Reported by: wedhorn
Tested by: snuffy, myself
Patches: 
    ast11-skinny-calllog01.diff uploaded by wedhorn (license 5019)
........

Merged revisions 379677 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@379678 65c4cc65-6c06-0410-ace0-fbb531ad65f3