tests: collect gdb commands

Collect all openssl calls of the test script as gdb-commands to a file
in TMPPDIR, to make debugging easier.

Debugging sequence example:
- run the tests (make check)
- uncomment the line in gdb-commands.txt you want to debug
- prepare the debugging environment (source debugvars)
- start openssl in gdb, set breakpoints and importi/source the
  gdb-commands.txt

Signed-off-by: Holger Dengler <dengler@linux.ibm.com>

tests/helpers.sh

@@ -40,6 +40,7 @@ cleanup_server()
 
 ossl()
 {
+    echo "# r "$* >> ${TMPPDIR}/gdb-commands.txt
     echo openssl $*
     eval openssl $1
 }