nsupdate_plugin: Exception logging now includes error output from nsupdate command

Bug 1089697
Bugzilla link https://bugzilla.redhat.com/show_bug.cgi?id=1089697
When troubleshooting DNS record addition/removal errors, it is helpful to have the error output from the nsupdate command. Specifically in scenarios where record changes only fail <1% of the time.
Follow rc convention and use Rails.logger to avoid large amounts of text in the exception string
Split duplicate code into seperate method
Pass dns action for logger as a string rather than a boolean
[stylesheets] - remove unit after 0 length.
Bug 1103367: Increasing timeout of the stop action in the MySQL cartridge
Add a section to inject information about external cartridges
Merge pull request #5473 from jwforres/external_carts_section

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Corrected cmd to enable correctly returning STDERR from nsupdate as STDOUT
Added fqdn to modify_dns method
Moved Rails.logger.error to before the raise
Merge pull request #5408 from tiwillia/master

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Merge pull request #5472 from jhadvig/timeout_bump

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Bug 1101499: Adjusting logic of gear state restoration
Bug 1086807 - Advertise $PATH for scaled SCL based cartridges
Bug 1103772 - Add svn client to support Redmine
Merge pull request #5453 from pivanov/css-small-fix

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Merge pull request #5475 from jhadvig/restore_db

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Merge pull request #5256 from mfojtik/bugzilla/1086807

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Merge pull request #5476 from jwhonce/bug/1103772

Merged by openshift-bot