## What changes were proposed in this pull request?
- extend most of the checkpoint operations into interface / implementations 
(keep checkInAll in InputManager)
- move complicated methods to Helpers
- make checkpoint file names to readable e.g.: `hdfs-<filekey>.cp`

That patch does not include javadoc changes, i will do that later with a patch 
which will include other javadoc changes for the whole logfeeder plugin api.

## How was this patch tested?
UTs passed.
FT: with docker env, and with docker env which only included logsearch portal , 
solr and zookeeper and started logfeeder manually ...multiple times, to make 
sure checkpoints still working

Please review @kasakrisz @g-boros @swagle 

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