add a random tag to our default XMPP resource value
if the user is still using our default "ChatSecure" resource, then
we should append it once with a random alphanum value so that there
are no issue with more than one device with the same resource is logged in
to same server at the same time
see: https://pthree.org/2007/07/13/why-xmpp-part-2-saving-your-resources/
set unique resource before initConnection()
When SessionID object is used as key, make sure to be specific
toString() doesn't always seem to produce the same results
this now works, and SMP req/response works
Merge pull request #564 from n8fr8/bug_fix_smp_response

Bug fix smp response