988024fe37 test: add check_node_connections in util (brunoerg)
Pull request description:
This function (`check_node_connections`) exists in `feature_anchors.py` and `p2p_add_connections.py` and does the same thing in both, this PR moves this function to util to avoid repetition and facilitate maintenance.
ACKs for top commit:
laanwj:
Code review ACK 988024fe37
Tree-SHA512: bf86c5659933539c72cb91ad587552b45c918be74d36fb429e78f3b954f01ed0855a85dd49aea35b432fbd18227c05eb3fec8b99c139c3509c39b19bccf6b7fd
The previous diff touched most files in ./test/, so bump the headers to
avoid having to touch them again for a bump later.
-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./test/
-END VERIFY SCRIPT-
This prevents the node from trying to connect to random IPs on the internet
while running the functional tests. Exceptions are added when required for
the test to pass.
