oo-diagnostics: Fix test_node_mco_log when no log

Make test_node_mco_log fail gracefully when the node mcollective log file
is absent.  Before this commit, the test would hang because it would run
a sed command with no input file provided.

This commit fixes bug 1077664.
oo-diagnostics: Fix comments for test_node_mco_log

Place comments with relevant code, consistently use proper case and
punctuation, and use whitespace for better logical grouping.
updates for RHSCL 1.1
Merge pull request #5409 from maxamillion/admiller/rhscl_1.1-RC2

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corrected section number
Bug 1096591 - Escape filenames for downloadable cartridges
Merge pull request #5410 from lnader/master

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update oo-exec-ruby for RHSCL-1.1, requires v8 runtime paths also
Merge pull request #5412 from jwhonce/bug/1096591

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Merge pull request #5413 from maxamillion/admiller/rhscl_1.1-RC2

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Merge pull request #4983 from Miciah/bug-1077664-oo-diagnostics-test_node_mco_log-fixes

Merged by openshift-bot