Replace which with type for CentOS7 compatibility
Replace which with type for CentOS7 compatibility

Base CentOS7 system may not have which command. Replace with more
portable `type -P`.

SuperNEMO-DBD/cadfaelbrew,SuperNEMO-DBD/cadfaelbrew,SuperNEMO-DBD/cadfaelbrew,SuperNEMO-DBD/cadfaelbrew