Increase build timeout, use builtin functions, debug mode for dockerctl

* Increase timeout to give more time for build process on weak
environments
* Remove dockerctl shell invocation from function, as shell_container
does the same
* Enable debug mode for docker as docker -D

Change-Id: Ice1914db7697debc4d4975180e3e89be7be084fb
Closes-Bug: 1317513
Merge "Increase build timeout, use builtin functions, debug mode for dockerctl"