test: add user/authority

tests/script/general/user/authority.sim

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+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/exec.sh -n dnode1 -s start
+sql connect
+sleep 3000
+
+print ============= step1
+sql create user read pass 'taosdata'
+sql create user write pass 'taosdata'
+sql show users
+if $rows != 5 then
+  return -1
+endi
+
+print ============= step2
+sql close
+sql connect read
+sleep 2000
+
+sql create database dread
+sql show databases
+if $rows != 1 then
+  return -1
+endi
+
+print ============= step3
+sql close
+sql connect write
+sleep 2000
+
+sql create database dwrite
+sql show databases
+if $rows != 1 then
+  return -1
+endi
+
+print ============ step4
+sql close
+sql connect
+sleep 2000
+
+sql show databases
+if $row != 2 then
+  return -1
+endi
+
+print ============ step5
+sql close
+sql connect read
+sleep 2000
+
+sql drop database dread
+sql drop database dwrite -x step51
+
+step51:
+
+sql close
+sql connect
+sql show databases
+if $rows != 1 then
+  return -1
+endi
+
+sql close
+sql connect
+sleep 2000
+sql drop database d1
+sql drop database d2
+sql drop database d3
+sql drop database d4
+
+system sh/exec_up.sh -n dnode1 -s stop  -x SIGINT