Messages logged to SPE file should be more descriptive

[michaellwest]

One idea I have in mind is that it should be more intuitive to know which remoting endpoint is called.

For example:

INFO A request to the remoting service was made from IP 10.0.0.27

This could be rewritten as:

INFO [Remoting] A request to the remoting service was made from IP 10.0.0.27, user: sitecore\admin

# When succeeds
INFO [MediaUpload] A request to the mediaUpload service was made from IP 10.0.0.27, user: sitecore\admin
INFO [MediaUpload] File uploaded: cover.jpg, size: 119719 bytes, item created: {7BA2D54C-A598-429C-883F-C028CAAB5796}

# When fails
WARN [MediaUpload] Unauthorized request to the mediaUpload service was made from IP 10.0.0.27, user: sitecore\admin, invalid credentials provided.