Normalize command execution environment

[kke]

Normalize command execution environment.

Cons:

• Ugly (sudo is now a function because aliases can't be inherited into subshells)
• Complex conditional logic
• It's not exactly normalized because of ^

Pros:

• Even subshells now have the env they're supposed to
• No need to reconnect
• Should work on Transport::Local
• No more env bash --noprofile --norc -x env -i sudo bash --noprofile --norc -s

Might be simpler and saner to create some sort of /usr/local/share/pharos/shell-exec

[kke]

I wonder what's wrong now, why does the kubectl get nodes after up fail? Is the proxy stuff actually working now and the command doesn't work because of that?

[jakolehm]

@kke rebase needed.