devenv test: wait for processes to start

[domenkozar]

• [ ] https://github.com/seanmonstar/reqwest/pull/1623
• [ ] check if this fixes rubyonrails example
• [ ] enable only when tests use process-compose

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[domenkozar]

For some reason even if the self.up() fails, the PID is still running so it takes 60s to timeout.