Improve SanitizeName

[jamesnetherton]

I found a couple of small issues with the current implementation of SanitizeName.

1. If you try to create an integration using a path like:

$ kamel run ../../examples/foo.java

You get:

Error: unable to determine integration name

2. If you use a URL, the first part of the host name is used. So with GitHub you end up with the slightly odd name of 'raw'.

$ kamel run https://raw.githubusercontent.com/apache/camel-k/master/examples/Sample.java

integration "raw" created

Maybe it'd be better to base the name on the actual file name (just like how it works when passing a filesystem path to the kamel binary). And fallback on host name if its not present.

If we think its worth improving, I can submit a PR.

[lburgazzoli]

@jamesnetherton a PR would be very welcome