MSP-11147
Merge to get framework instance cleanup, which should clean up a lot of
thread leaks too.
Conflicts:
Rakefile
lib/metasploit/framework/spec.rb
spec/spec_helper.rb
MSP-11147
Detect thread leaks in a `before(:suite)` configured by
`Metasploit::Framework::Spec::Threads::Suite.configure!` and fail if any
leaks are found.