Added clarification for the VERBOSITY setting to etc_default_asterisk

Added clarification for the VERBOSITY setting to etc_default_asterisk

Clarified that using the VERBOSITY setting in etc_default_asterisk is the
same as using the -v command line switch, which causes Asterisk to launch
in console mode.

(closes issue ASTERISK-17030)
Reported by: Jonas
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Merged revisions 353550 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 353551 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@353552 65c4cc65-6c06-0410-ace0-fbb531ad65f3