cli: dns: display problem fixes
lazycat: config: add runtime debug turn on/off support

logging.basicConfig() would work only at root of logger, it doesn't work
in leaves.
lazycat: dns: add time counting

And do deep copy when init ShuTong, if not, things may mess up.
cli: dns: print result as table
Revert "cli: dns: print result as table"

This reverts commit 3ea484ebf0c37736a5a676f44a616cacafc6d6e4.

Save this as a option, redefine the table.
lazycat: dns: redefined output format
lazycat: dns: implement 'dns trace ...'