Updated script to handle sed issues

Updated script to handle sed issues

The 'sed' line added to the updParentVersion script introduced 2 problems:

1) sed inline edit (-i option) saves a backup copy unless you pass the
empty string ('') as the suffix , which is the arg to the -i option.
2) BSD sed (e.g. the version installed in Mac OSX) does not support \n
as newline in replacement strings.  The more portable solution is to
simply escape a literal newline in the replacement string.

Change-Id: Ia3a3b2635b8cc9ce57ec41c2e55c1384587325c7
Issue-ID: CCSDK-2308
Signed-off-by: Dan Timoney <dtimoney@att.com>