Trailing slash in server_addr in qtlicd.ini breaks network requests

By mistake I've set the setting server_addr in qtlicd.ini to be
server_addr=http://10.215.117.32:8080/
instead of
server_addr=http://10.215.117.32:8080

The last slash "/" created problems with connections. Pinging with
`http://10.215.117.32:8080//api/v2/ping` does not work.

So if possible it might be good to remove the last / in server_addr when specified.