extend test framework functions

[pinheadmz]

anything pertaining to node must be extended into docker, examples:

assert_debug_log()
restart_node()
add_nodes()

also classes like P2PInterface() should be able to run locally but interact with deployed nodes

[willcl-ark]

Is this still an issue?

[pinheadmz]

yes a contributor trying to write a scenario using these or many other Test Framework methods is gonna have a bad time :-(