Backup the existing opensrf config files before copying

Backup the existing opensrf config files before copying

Per a suggestion from Wolf Halton <wolf.halton@gmail.com>, create backup
versions of the opensrf configuration files when we're copying the
Evergreen example versions over, so that we can retrieve the Jabber user
names and passwords and domains from the backups (if necessary).

Signed-off-by: Dan Scott <dscott@laurentian.ca>