Move tests/*.c to tests/src/*.c and adjust Makefile.in accordingly.

Move tests/*.c to tests/src/*.c and adjust Makefile.in accordingly.
Move setting of $CTDB_NODES_SOCKETS to tests/scripts/run_tests and
make it only happen if $CTDB_TEST_REAL_CLUSTER is not set.  Bugfix in
function ips_are_on_nodeglob.  New/proper implementations of functions
stop_daemons and start_daemons, now called by function restart_ctdb.
In start_daemons.sh, add public addresses file generation/usage, use
new option --nopublicipcheck to ctdbd to avoid crazy behaviour and
kill ctdbd more carefully to avoid killing real daemons on a real
cluster - this should be able to coexist on a node of a real cluster.
start_daemons.sh is temporarily incompatible with start_daemons
function, but expecting to replace that script with function calls
very soon anyway...

Signed-off-by: Martin Schwenke <martin@meltin.net>