Fix reload skinny with active devices.

Patch ensures that d->activeline and l->activesub are moved over to the
new device and line so that on callend the appropriate subs can be found
to complete hangup before device resets.

(closes issue ASTERISK-16610)
Reported by: wedhorn
Tested by: snuffy, myself
Patches: 
    skinny-reloadactive01.diff uploaded by wedhorn (license 5019)


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@380942 f38db490-d61c-443f-a65b-d21fe96a405b