Some "improvements" to linktest ...
* The linktest daemon (the one that runs on the nodes) no longer talks to boss directly, but instead contacts the local elvind; rc.linktest is changed to reflect that. * A bunch of signal handler changes to run_linktest.pl; do not rely on events to stop linktest when it is running on boss; when the user kills a running linktest make sure all the processes are killed explicitly. * New wrapper script (linktest_control) for use on boss, specifically when being called from the web interface. This script handles the DB part (getting linktest_level and linktest_pid), making sure that only one linktest is running at a time (on boss) and reseting the pid in the DB as needed. The -k option kills a running linktest, and is invoked from the web interface when the user wants to kill one in progress. This gets the pid from the DB and sends it a TERM signal, which sends a TERM to the run_linktest.pl script, which sends a TERM to the ltevent helper app. Note that this wrapper is also suitable for the XMLRPC interface, although I have not added it there yet.