SERVER-8510 Factored out option storage in tools

Conflicts:
	src/mongo/SConscript
	src/mongo/tools/bsondump.cpp
	src/mongo/tools/dump.cpp
	src/mongo/tools/export.cpp
	src/mongo/tools/import.cpp
	src/mongo/tools/oplog.cpp
	src/mongo/tools/restore.cpp
	src/mongo/tools/stat.cpp
	src/mongo/tools/tool.cpp
	src/mongo/tools/tool.h
	src/mongo/tools/tool_options.cpp
	src/mongo/tools/tool_options.h