cli/boot: Read partition base name from config

also add missing test for slapos node boot
.gitlab-ci.yml not found in this commit
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Jerome.Python2

12:50

passed SlapOS.Eggs.UnitTest-Jerome.Python3

16:05

failed SlapOS.Eggs.UnitTest-Jerome.Python2

failed SlapOS.Eggs.UnitTest-Jerome.Python2

15:11