[capwap] fixing bugs in handling the ctld session
[capwap] fixing bugs in handling the ctld session

Summary: Testing on scg4.

Test Plan: read, accept

Reviewers: aschultz, druss

Reviewed By: aschultz

CC: kreer, ejobs, hsychla, mkraemer, druss, aschultz

Differential Revision: https://review.tpip.net/D1352

travelping/capwap,travelping/capwap