Olivier SOLDANO authored Feb 14, 2018 and Guillaume Roguez committed Feb 15, 2018

When the TLS session was closed during path mtu discovery,
the EINTR signal was captured by the retry loop, causing
it to loop indefinitelly as the state of the session was
TlsSessionState::SHUTDOWN ; each retry triggering another EINTR
from TlsSessionImpl::waitForRawData, making gnutls_heartbeat_ping
to return GNUTLS_E_INTERRUPTED on the pong wait).
the guard to this loop was modified to take into account the state
of the session on GNUTLS_E_ITERRUPTED.

Another do/while loop was guarded by the same condition in
TlsSessionImpl::send, the same countermeasures have been
put in place.

Change-Id: Ib2ab8975c8044d9bac0abdcace94d79b5eeb75b9
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>