common/perf_counters: Add 'perf reset' command for 'ceph --admin-daemon'

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
test/perf_counters: add test for 'perf reset'

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
test/perfcounters: Move perfcounters_dump to perf dump.

The func of command perfcounters_dump and perf dump are the same.
But from the print "ceph --admin-daemon asok help", it only print perf
dup. So rename.
In order to keep consistent, still keep perfcounters_dump for old user.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>