Pip can install multiple dependencies at the same time, so there is no need to
use xargs -n1. It's significantly slower with -n1, so let's not do it with no
reason.

* Factor out more common code from the jenkins scripts

* Fix install_and_run path

* Poke jenkins

* Poke jenkins

* Factor out some of the code shared between the different sytest jenkins scripts

* Exclude jenkins from the MANIFEST

* Fix dendron build

* Missing new line

* Poke jenkins

* Export the PORT_BASE and PORT_COUNT

* Poke jenkins