Rework conn init to be stomp.py 3.1+/4 compliant
Rework conn init to be stomp.py 3.1+/4 compliant

- we could (maybe) still support 3.0.X, but it's not pip installable
  and forces us to use SSLv2or3 which are outdated
- compatibility tested on SL6 and SL7

stfc/ssm,apel/ssm,stfc/ssm,apel/ssm,tofu-rocketry/ssm,tofu-rocketry/ssm