mon: MDSMonitor: do not allow ec pools to be used for data or metadata

Fixes: #8624

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
qa/workunit: cephtool: test mds newfs and add_data_pool with ec pools

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: MDSMonitor: print pool name along with id during 'newfs' errors

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>