impl global acl feature.
It allows you to applay global ACL for all auth_acl_check with a ACL pattern which can use special substitutions; i.e., %c, %u subs.
Merge branch 'feature/global_acl' into forkstream
debug '-i' option of np command.
java compatible SHA name.
Fix the bug reported following;
  https://github.com/jpmens/mosquitto-auth-plug/issues/29

Comment:
'userdata' is not a context per user in current implementation.
So unpwd_check and acl_check should be processed independently.
impl. superuser_password
Enhance np command:
 it can be given key length with '-k' option.
 it can be given salt length with '-s' option.
MySQL ACL debug and enhancement:
 fix a bug which mosquitto is down when performing mysql_acl.
 impl. %u special substitusion for mysql_acl.
 access control enhancement -> can specify read-only, write-only, read-write.
Merge branch 'dev/mysql_acl/%u_and_rw' into forkstream
impl. plugin log level
reviewing log level in be-mysql.c
add checking args and some logs
Merge pull request #4 from flightonary/forkstream

merge Forkstream