Changes all usages of runMongoProgram(<mongo tool>, ...) to
MongoRunner.runMongoTool(<mongo tool>, {...}) to take advantage of the
--dialTimeout command line option supported by the mongo tools.
Adds support for specifying positional arguments to
MongoRunner.runMongoTool() in order to support all invocations of the
bsondump and mongofiles tools.
No functional changes, just converting everything to use the JSON-based
constructor.
Also moves some sharding-specific tests out of noPassthroughWithMongod and
under the sharding suite.
