make time format compatible with tshark v1.6.7
tshark 1.6.7 looks for "RSA" lines rather than "CLIENT_RANDOM" in sslkeylog
run ssh with IdentitiesOnly=yes
add tsharktest to check tshark's version on Linux
detect an older tshark version which doesn't support -Y
don't sleep on the first iteration when looking for HTML
sleep longer if FF triggers a false page load event