[BUG] GeoIP - Download ready flag

[ashoktelukuntla]

Describe the bug
Please address comments in issue : #2925

Issue : downloadReady flag and also global usage of this flag.

To Reproduce
Review comments to be addressed

[kkondaka]

@venkataraopasyavula can you take a look? And if this is not a bug please provide explanation.

[venkataraopasyavula]

The default value of "downloadReady" is false. When downloadReady is false, the thread will be in wait() state.
The downloadReady flag will become true after download is completed and call notifyall() so that the wait state thread will resume and do further operation.
Download thread will be called based on the cache refresh schedule.
During enrichment the downloadReady flag will be chcked whether download is true or not.
If new download is available (i.e downloadReady = true) switch the reader. If downloadReady = false continue enrichment.