End current session if can't resume

[shalinnijel2]

Summary:
This change follows an issue seen with a real EV where attempting to resume an existing session fails. In this case we were attempting to resume a connection that was reset by the peer.
If resuming a session fails, now we

• Cancel the existing task associated with it and remove the session entry from self.comm_sessions list.
• Create a new SECCCommunicationSession and add that to self.comm_sessions list.