SERVER-12034 Fix bug with SIGXCPU causing a core dump in mongoD/mongoS.

Graceful shutdown was chosen so we can log the signal; There is no risk
of data corruption.

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
SERVER-12210 test update/buildbot fix
SERVER-9038 Shell Batch API implementation

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
SERVER-12157 Replace implementation of StringMapDefaultHash::operator()
with Murmur3. This has proven to be more effective in terms of speed
and collision rates.
Merge remote-tracking branch 'upstream/master'