Pre-commit build / FindBugs diff tool: limit the number of error messages that appear inside a JIRA comment

OOZIE-1986 introduced usage of the FindBugs diff tool when applying a patch within the bin/test-patch series.

Now the problem is that when there are lots of FindBugs diff errors found within the current patch, all of the error message summaries are printed within a JIRA comment, making it not well readable.

The goal is to have an upper limit on error message descriptions within the JIRA comment, both on a per-module (10) and on a per-parent-module (25) basis. Let those limits be printed along the JIRA comment.

Let the text file available via Jenkins have all the error messages - JIRA comment and text file content would be different in that case.