fix(router): Set default values in /deis/router

Global router settings should be set in /deis/router and not
/deis/router/$HOST
fix(tests): shrink deis pull image by 200MB
fix(tests): add registry log output on error
Merge pull request #1938 from johanneswuerbach/fix-router-default-values

fix(router): Set default values in /deis/router
docs(deisctl): document DEISCTL_UNITS better
Merge pull request #2014 from gabrtv/fix-pull-test

fix(tests): shrink deis pull image by 200MB
Merge pull request #2017 from Xe/docs/deisctl/custom-units

docs(deisctl): document DEISCTL_UNITS better