4401. [misc] Change LICENSE to MPL 2.0.
update copyright notice
3961. [bug] Forwarding of SIG(0) signed UPDATE messages failed with BADSIG. [RT #37216]
2170. [func] Add acache processing to test suite. [RT #16711]
1574. [bug] Don't attempt to open the controls socket(s) when running tests. [RT #9091]
copyright update
added notify-source options
added 'transfer-source' directives to all system test named.conf files, so that tests succeed while transfer-source is still being (ab)used as the notify source address
make spacing in listen-on-v6 option consistent with other options
Initial update forwarding test suite.