[fix] network sort: integer value were sorted as strings.

numbers must be sorted as int(). It is not working with port:

|       cgeek.fr        |  10900 |
|   gtest3.elois.org    |  10900 |
|   gtest.duniter.org   |  10900 |
|                       |  30398 |
|   copper.jellium.io   |    443 |
| …st.duniter.tednet.fr |   8888 |
|  duniter.grohub.org   |   8999 |