mon: s/rep/replicated/ in pool create prototype

The test is updated to remove unecessary asserts. Since all combinations
of properties and pool type are allowed, there is no way to statically
check the validity of the arguments.

Signed-off-by: Loic Dachary <loic@dachary.org>
Merge pull request #983 from dachary/wip-rep-replicated

mon: s/rep/replicated/ in pool create prototype

Reviewed-by: Sage Weil <sage@inktank.com>