bugfix rsgtutil: deletion of logs at end of file was not reported

The verification function in rsgtutil tool did not report deletion of
whole signed blocks of lines from the end of the log file.
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nits: small corrections to ChangeLog
bugfix imklog: pri was miscalculated

actually, the pri was totally off the real value for PRIs > 9
bugfix imklog: missing prototype
Merge branch 'v7-stable' into v8-stable
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