tests: Limit each log to 10 GiB

Limit log output in compat.sh and ssl-opt.sh, in case of failures with these
scripts where they may output seemingly unlimited length error logs.

Note that ulimit -f uses units of 512 bytes, so we use 10 * 1024 * 1024 * 2 to
get 10 GiB.

tests/compat.sh

@@ -15,6 +15,10 @@
 
 set -u
 
+# Limit the size of each log to 10 GiB, in case of failures with this script
+# where it may output seemingly unlimited length error logs.
+ulimit -f 20971520
+
 # initialise counters
 TESTS=0
 FAILED=0

tests/ssl-opt.sh

@@ -21,6 +21,10 @@
 
 set -u
 
+# Limit the size of each log to 10 GiB, in case of failures with this script
+# where it may output seemingly unlimited length error logs.
+ulimit -f 20971520
+
 if cd $( dirname $0 ); then :; else
     echo "cd $( dirname $0 ) failed" >&2
     exit 1