[PATCH] ctdb-scripts: Avoid shellcheck SC1117: Backslash is literal in "..."

[Martin Schwenke]

This warning (apparently new in shellcheck 0.4.7) only applies to
double-quoted strings.  Change affected constant strings to use
single-quotes.  In the one example that contains a variable expansion
escape the backslash as recommended.

Please review and  maybe push...

peace & happiness,
martin
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