TBASE-306

Add support for continuous query in Lua connector.

enhance `taos_options` to support cocurrent calls.
note it still a problem if one thread is modifying a global configuration
while another thread is reading it.

add more atomic api

remove illegal usage of configure file path

Update connector-ch.md for python

Malloc memory to store Lua state and callback function from Lua. Connector can support multiple connection by this way.
Memory will be freed when connection isn't established successfully or connection is closed by lua call. Stream content
in Lua is not the same one with stream content in connector.

A loop in test code do the job for continuous query. record is inserted between query actions.

Feature/mergecode

add update check command type

# Conflicts:
#	src/client/src/TSDBJNIConnector.c

[TBASE-816]

[TBASE-1099] fix bug referred in issue #699, refactor some codes

Feature/lihui

Feature/lihui

[TBASE-1047] 

Feature/liaohj

Feature/newtimer