MSIM: Fix flex map related issues

1. Send FINISH with failure status if any of the
   START request fails.

2. When set radio cap request timeout happens, to cleanup
   ongoing transcation ProxyController sends FINISH with
   failure status, while sending FINISH reuqests it
   generates a new session id, but the generated new
   session id is not updated in global variable and because
   of that the FINISH response is ignored.
   To fix this update the generated new session id in
   global variable and reset the RAF status counter to 0.

3. While sending FINISH pass new RAF/modem Uuid
   if overall request is success.

Test: performed flex map sanity
Bug: 28382997
Change-Id: Ibc8f5ed14616b4c5fe5694fe2717ce75704e4bf8