Rename RemoteProxySettingsConfiguration to GlobalRemoteProxySettings (to be inline with similar global settings)

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Make HC4 clients use the user agent customisation string from (global) remote context

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge pull request #43 from sonatype/simplify-remote-proxy-settings

REVIEW: Rename RemoteProxySettingsConfiguration to GlobalRemoteProxySettings (to be inline with similar global settings)
[NXCM-5316] Add utility method for determining http/https proxy settings based on an URL

This eliminates code duplication and eventual errors in selection algorithm

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>