SERVER-6352 Add sh.removeTagRange

Adding the removeTagRange helper to match addTagRange with some informational warnings that do not stop the operation from happening.

Note: does not address the fact that no feedback is given to indicate work done, or lack of work done (must check config.tags manually for results).
      This is also the case for addTagRange.

Closes #709

Signed-off-by: Benety Goh <benety@mongodb.com>