cleaner: Fix null pointer exception in 'hsms attached to pool' command

Addresses a null pointer exception in the cleaner.

Ticket: http://rt.dcache.org/Ticket/Display.html?id=7769
Target: trunk
Request: 2.6
Request: 2.2
Require-notes: yes
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/5493/
gplazma2-jaas: add principal mutator plugin

JAAS plug in can be configured to use any jaas login module. As a
result we may get principas which can't be handles by gplazma. New
MutatorPlugin allows to convert some principals to supported equivalents.

in gplazma.conf:
auth jaas
...
map optional mutator gplazma.mutator.accept=org.apache.activemq.jaas.UserPrincipal gplazma.mutator.produce=username
map sufficient nsswitch
...

The supported output types:
   dn
   name
   username
   kerberos
   fqan

Ticket: #7763
Acked-by: Paul Millar
Target: trunk, 2.6, 2.2
Require-book: yes
Require-notes: yes
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Merge pull request #10 from gbehrmann/fix/2.6/rb5493

cleaner: Fix null pointer exception in 'hsms attached to pool' command
system-test: downgrade missing trust from an error to a warning

Currently, the system-test module checks whether the environment is
properly configured to run secure clients against the system-test.
If this test fails then the system-test build fails.

There are (at least) a couple of reasons why failing the build is
wrong:

  1.  there are situations where building the system-test should not
      dependend on being able to successfully test dCache via
      system-test (e.g., "mvn release")

  2.  the user may use a client that is configured to use the
      trust-store provided within system-test.  Therefore, missing
      trust in the default locations isn't always a problem.

This patch downgrades the test failing from an error to a warning.  The
patch also rewords the message to try to avoid some confusion
experienced by users.

Patch: https://rb.dcache.org/r/5533/
Acked-by; Tigran Mkrtchyan
Target: master

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] prepare release 2.6.0
[maven-release-plugin] prepare for next development iteration