Remove the trailing space in the module name, homepage and repository

When we install using `--local` option, the package name is parsed from `package.json`. It's weird to see a folder that has a trailing space:

```
# ls /var/lib/shinken/modules/
auth-cfg-password/               dummy_broker_external/           __init__.py                      sqlitedb/
booster-nrpe /                   dummy_poller/                    nsca/                            syslog-sink/
dummy_arbiter/                   dummy_scheduler/                 pickle-retention-file-generic/   ui-graphite/
dummy_broker/                    graphite/                        pickle-retention-file-scheduler/ webui/
```