Dear Airflow Maintainers,

This is a change in the way we render logs. This PR will give a dropdown of 
number of lines to be tailed with a refresh button. On refresh webserver fetch 
selected number of lines from local worker logs or remote worker logs. On can 
toggle this feature using config variable tail_logs in webserver, default 
number of lines to tail via config variable num_lines in webserver and items in 
dropdown can be controlled via config variable tail_lines_list in webserver in 
csv format

Please accept this PR that addresses the following issues:
https://issues.apache.org/jira/browse/AIRFLOW-620

Testing Done:

Manually tested on all major browsers.
This will add a dropdown of number of lines to be tailed and refresh button to 
get latest logs instead of refreshing the whole page.

[ Full content available at: 
https://github.com/apache/incubator-airflow/pull/3992 ]
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