Add 'all' parameter to sccp show session, to show session which have non registered devices

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5174 43c1dc8c-776e-4df2-8ef1-6e829299be21
Revert to previous behaviour to handle devices which connect, but do not start to register

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5175 43c1dc8c-776e-4df2-8ef1-6e829299be21