Backport JGlobus2 support to 2.2 to support SHA2

This patch backports a series of patches that switch dCache from using JGlobus v1.8 to v2.0.  This change affects:
  SRM,
  WebDAV (if using ssl-jglobus connector),
  GridFTP,
  gsidcap,
  xrootd's GSI authn plugin,
  pools (if SRM is used to initiate 3rd-party transfer push of data),
  gPlazma-1,
  gPlazma-2 plugins: X509, voms, XACML

The change is motivated by the need to support "SHA2 certificates" (that is, certificates built using sha224, sha256, sha384 or sha512 hash algorithms).

It is intended that dCache provides the same level of functionality with JGlobus-2 as was provided with JGlobus-1.

Requires-notes: yes
Requires-book: no