Also show NEOS_BASE_URI in ssh prompt

[baschny]

Should match these variants we have in our projects:

NEOS_BASE_URI=https://neos-test8.example.com
BASEURL_MATCHCODE=http://www.example.com.vm:8080/
BASE_URL=http://www.example.com.vm:8080/
...

But ignore stuff like:

S3_PUBLIC_BASEURI=https://xxx.cloudfront.net/public
...