ENG-5690: Add shutdown hook to print log message, disconnect mesh on
Ctrl-C.  Remove the shutdown hook when crashLocalVoltDB is called to
avoid "weirdness".  Use removal to avoid messages when running the
compiler.
Merge pull request #1180 from VoltDB/eng5690

ENG-5690: Add shutdown hook to print log message, disconnect mesh on Ctrl-C. Remove the shutdown hook when crashLocalVoltDB is called to avoid "weirdness". Use removal to avoid messages when running the compiler.

r=akhanzode