* develop: (25 commits)
  fix table/column_num.py coredump
  fix table encode and decode bug
  [td-430] fix bug while client does not retrieve or paritally retrieve result from vnode.
  fix name bug
  TD-354
  [TD-90] fix invalid read
  [TD-90] add insert and modify tag schema
  bugfix: alloc space for holding null-terminator
  update connector document
  fix option uint print
  define error in hex
  security flag shall be reset if a newlink from client
  [TD-90] tagschema develop
  TD-423
  [TD-90]tagschema develop
  fix tests/test/c/importPerTabe.c typo
  [TD-90] tag schema develop
  shell suport multiple commands in single statement
  scripts
  [TD-410] not print local error msg
  ...

Feature/2.0tsdb

[td-430] fix bug while client does not retrieve or paritally retrieve…

[TD-90]Change TagSchema Feature/tagschema

bugfix: alloc space for holding null-terminator

td-342: shell multiple statements support

security flag shall be reset if a newlink from client

define error in hex

Hotfix/sangshuduo/fix import per tabe name

TD-423

Hotfix/log

[TD-429]

* develop:
  support glibc 2.17 (default version of CentOS7).
  [td-225]fix bugs in diff
  [td-225]fix bugs in fill for super table query
  [modify script for arbitrator function]
  [modify script for arbitrator function]
  update shellPrintNChar
  Update TSDBDriver.java
  TD-407: add config for binary column display width
  add insert/sparseData.py to test compressing sparse file content.
  query with and/or/illegal filter