Support multiple jenkins instances in one config file

[radomirbosak]

Suggested syntax:

$ cat ~/.jenkins-cli
[local]
host=http://localhost:8080/
username=rado
password=mypassword

[stage]
host=http://jenkins-stage.example.com/
username=rado
password=myotherpassword

[prod]
host=http://jenkins-prod.example.com/
username=produser
password=mydifferentpassword

And then use

$ jenkins jobs --environment prod

or simply

$ jenkins jobs -e prod