auth,common: switch to ceph::mutex, etc

auth,common: switch to ceph::mutex, etc

in this change, along with LockPolicy, src/common/lock_* are completely
removed.

instead of using LockPolicy based template specialization of LockMutex,
etc, it would be simpler if we can just rely on WITH_SEASTAR
preprocessor macro to tell if we are compiling code for crimson or not.
but please bear in mind, we cannot link against the plain libceph-common
in crimson anymore.

Signed-off-by: Kefu Chai <kchai@redhat.com>