Fix dateparser py2 (aliyun#197)

* fix version of dateparser as 0.7.6

* Update HISTORY.md

Update version.py

to v0.6.47

Update logclient.py

Update version.py

enable end_time for consumer group mode in sub-command transform_data

fix issue aliyun#117 and consider race condition for heatbeat data op…

…eration

refine doc

support auto_escape for case "abc\"xyz" in KV

add related test case

fix legacy index format issue