properly define nslookup
[solaris] silence tools not available on solaris < 5.10
[remote exec] set ssh keepalive options to hopefully prevent rare ssh hangs"
cosmetics after dd837bd05bdd4ec42084a5d7ca66cd102283bd8d
[solaris] fix solaris 10 detection
new function exec_with_timeout

some jboss versions/installs just hang infinitely when called with -V, so we need a timeout
filter out snoop processes