icat SNS support

[Jay Rainey]

In order to support ​cross facility querying we first need to add an implementation for ICAT at SNS.

In order to facilitate this I will need to:

1. Generate the gSoap files against the SNS soap end-point.
2. Update Facilities.xml to include catalog info for SNS. E.G.

  <catalog name="ICat4x2Catalog">
    <soapendpoint url="https://icat-testing.sns.gov:8181/ICATService/ICAT"></soapendpoint>
    <externaldownload url="needs_updated"></externaldownload>
    <filelocation>
      <prefix regex="needs_updated"></prefix>
      <windows replacement=""></windows>
      <linux replacement="needs_updated"></linux>
      <mac replacement="needs_updated"></mac>
    </filelocation>
  </catalog>

3. Create a new catalog class (named: ICat4P2Catalog.cpp) to implement the ICAT functionality provided by the gSoap generated files. This will exclude externally downloading as it will be implemented in a separate ticket.

[Peter Peterson]

This is related to #8811

[Jay Rainey]

This is no longer valid as #8811 addresses these, and has been merged into master.

[Stuart Campbell]

This ticket has been transferred to github issue ​9538