Implemented connection fail solver and updated Dockerfile

[aanm]

I was having some troubles with powerstrip where if a request was dropped powerstrip didn't retried again. I add a simple method to retry it. While I was building the docker image I saw some dependencies conflicts and that's why I had to change the pyasn1 installation source.

Signed-off-by: André Martins aanm90@gmail.com

[lukemarsden]

Thanks @aanm!