calamari-common: add CRUSH_MAP type

Signed-off-by: Gregory Meno <gregory.meno@inktank.com>
rest-api: change rendering of crush_map endpoint

Signed-off-by: Gregory Meno <gregory.meno@inktank.com>
rest-api: add ability to set crushmap

Signed-off-by: Gregory Meno <gregory.meno@inktank.com>