Each tag argument can also be specified more than once and in both the
YAML suite definition and on the command line.
Tag argments will be agnostic to ordering, with each argument narrowing
down test files to be run. No tag is allowed to override another tag.
Split out the passthrough tests into separate suites. The MongoDB
deployment is started up by resmoke.py so that we can record the
success/failure of each individual test in MCI.
Added support for parallel execution of tests by dispatching to
multiple MongoDB deployments.
Added support for grouping different kinds of tests (e.g. C++ unit
tests, dbtests, and jstests) so that they can be run together. This
allows for customizability in specifying what tests to execute when
changes are made to a particular part of the code.
