PROV-1047: Properly fix config.ru by writing it from configure.sh(cherry picked from commit 9cbfc3e23364ba91d305c21fda420bbfc40a9acf)
PROV-1047: Properly fix config.ru by writing it from configure.sh(cherry picked from commit 9cbfc3e23364ba91d305c21fda420bbfc40a9acf)

kaizengarden/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,numericillustration/sdc-headnode