Update backup and restore role docs

The backup server doesn't do restores directly, so we shouldn't mention the backup service in the docs on the "restore" role.  Also added reference to mongodump and mongorestore.

Signed-off-by: Sam Kleinman <samk@10gen.com>
edits to built in role page
DOCS-2502 runtime options: shared options
DOCS-2502 runtime options: removing an extra layer of nesting
DOCS-2502 runtime options: move mangpage-options-ssl-tools to options-shared
DOCS-2507 runtime options: mongoexport, part I
DOCS-2502 runtime options: move manpage-options-auth.rst to options-shared
DOCS-2507 runtime options: mongoexport, part II