#1 Separate tests that require networking from those that don't

[Pedro Padron]

When building a package from the source of Nmap::Scanner, it is possible that you do not have outside network access.

The file event_tcp_syn_scan_from_file.t contains tests for parsing XML files, which should not require network. However, the last test in the file fetches a remote XML file for testing. This patch separates the latter onto a new file (event_tcp_syn_scan_from_remote_file.t), so it can be easily skipped.