[client] minor bug fix for condition under which fiu_* functions are called for fault injection
[test suite] in valgrind mode, make tests fail whenever there are 'definitely' or 'indirectly' lost bytes in memory
[test suite] make valgrind suppressions slightly more perscriptive
[libfko] bug fix to check strdup() return value

Using the 'fiu-run' fault injection binary, a couple of cases were
turned up with libfko does not properly check the strdup() return value.
This commit fixes these issues, and here is an illustration of the stack
trace for one such issue:

  Core was generated by `../client/.libs/fwknop -A tcp/22 -a 127.0.0.2 -D
  127.0.0.1 --get-key local_spa.'.
  Program terminated with signal 11, Segmentation fault.
  #0  __strnlen_sse2 () at ../sysdeps/x86_64/multiarch/../strnlen.S:34
  34      ../sysdeps/x86_64/multiarch/../strnlen.S: No such file or directory.
  (gdb) where
  #0  __strnlen_sse2 () at ../sysdeps/x86_64/multiarch/../strnlen.S:34
  #1  0x00007effa38189bc in _rijndael_encrypt (enc_key_len=<optimized out>, enc_key=<optimized out>, ctx=0x7effa5945750) at fko_encryption.c:141
  #2  fko_encrypt_spa_data (ctx=0x7effa5945750, enc_key=<optimized out>, enc_key_len=<optimized out>) at fko_encryption.c:605
  #3  0x00007effa381a2d6 in fko_spa_data_final (ctx=0x7effa5945750, enc_key=enc_key@entry=0x7fff3ff4aa10 "fwknoptest", enc_key_len=<optimized out>, hmac_key=hmac_key@entry=0x7fff3ff4aaa0 "", hmac_key_len=0) at fko_funcs.c:489
  #4  0x00007effa405f2fb in main (argc=<optimized out>, argv=<optimized out>) at fwknop.c:449
[server] minor fwknopd --help output update
[server] skip fw initialization and cleanup in --test mode
[server] skip replay storage in --test mode (since we're not granting access anyway)
[test suite] added fiu-run fault injection tests against the fwknopd server
[server] clean up fko_destroy() calls in main access stanza loop
[libfko] free() temp buffer right after strdup() call, add libfiu fault injection tags
[server] skip firewall rules check in --test mode
[test suite] always run crash check at the end of test run
[test suite] add several fault injection tests