Improve FreeBSD compatibility

tools/confidence_test.sh

@@ -192,7 +192,7 @@ become_bob
 # This users's default group:
 DEFAULT_GID_NUM=$(id -g)
 # Pick a group that is not the default group:
-TEST_GID_NUM=$(id -G | fmt -1 |  grep -xv "$(id -u)" | grep -xv "$(id -g)" | head -1)
+TEST_GID_NUM=$(id -G | fmt -1 | sort -rn | grep -xv "$(id -u)" | grep -xv "$(id -g)" | head -1)
 echo "DEFAULT_GID_NUM=$DEFAULT_GID_NUM"
 echo "TEST_GID_NUM=$TEST_GID_NUM"
 

tools/test_functions.sh

@@ -21,7 +21,7 @@ function PHASE() {
 function md5sum_file() {
   # Portably generate the MD5 hash of file $1.
   case $(uname -s) in
-    Darwin )
+    Darwin | FreeBSD )
       md5 -r "$1" | awk '{ print $1 }'
       ;;
     Linux )