Add checkout attempts for stability and fix minor issues

[SOVALINUX]

1. Add checkout attempts, since stats showed it can be very unstable regarding of network
2. Fix pom and resource versions

[SOVALINUX]

I was thinking about adding checkout property to configuration form, bit not sure, that this is really useful functionality

[ashwanthkumar]

@SOVALINUX Sorry for not getting back sooner. Can you shed some more light on this change? What was the scenario you observed and how this fix helps?

[SOVALINUX]

In my logs were a lot of errors that material checkout failed, since git fetch command returned exit code 1 or 128. As I said above it may be caused by network problems. After applying this fix locally it became much better.
Actually this fix is a bit dirty. Better to add checkout timeout for 10 minutes for example. And within this timeout there might be several attempts

[ashwanthkumar]

Can we also add attempt count as part of the log? It helps while debugging.

[ashwanthkumar]

Thanks @SOVALINUX. If you could just fix the conflicts, I would merge the changes.

[gregoryfischer]

@ashwanthkumar - Were the ongoing issues of 128 errors addressed in other PRs or versions that this attempted to address but died on the vine in 2015.

Related to #144 and #118

[MPV]

Any news on this?