builder: Try even harder to update rosdep

builder/image-ros.sh

@@ -42,7 +42,7 @@ echo_stamp() {
 my_travis_retry() {
   local result=0
   local count=1
-  while [ $count -le 3 ]; do
+  while [ $count -le 30 ]; do
     [ $result -ne 0 ] && {
       echo -e "\n${ANSI_RED}The command \"$@\" failed. Retrying, $count of 3.${ANSI_RESET}\n" >&2
     }