Pcep and clustering, starting at once, lead to Transaction factory was closed.

This looks like a direct analogue of https://bugs.opendaylight.org/show_bug.cgi?id=1535

Attached compressed log, where:
0. Karaf is re-started after being gracefully shut down with bunch of features installed.
1. PCEP services starts up successfully, sessions are established.
2. Clustering features finish booting up.
3. A (maybe unrelated?) controller configuration change triggers a nasty error.

https://git.opendaylight.org/gerrit/#/c/10014/ looks like easily transferrable fix.

This bug is filed against PCEP, but BGP has it too; who knows how many other projects could use the fix too.