td-40: move 'alert' project into tdengine

Feature/liaohj

[merge hotfix/#523]

Fix memory leak p mem buffer

[TD-71] fix potential sprintf overflow issue.

fix pSupporter memory leak in vnodeRead.c

fix unclosed fd resource leak in vnodeFile.c

[TD-71] fix sqlstr uninitialized use issue.

fix base64 memory leak in httpAuth.c

fix pCond double free issue.

fix pMeter memory leak in mgmtMeter.c

fix cmd memory leak in shellImport.c

fix pServerObj memory leak in ttcpserver.c

fix pTcp memory leak in ttcpclient.c

fix use after free pSql.

fix #1378

fix pReducer resource leak.

fix ahandle memory leak in tscServer.c

fix pTree memory leak in vnodeQueryImpl.c

fix missing break in switch in textbuffer.c