srm-client: Fix logback configuration

Ever since common-cli was introduced, the console logback configuration
gets included in the srm package. This causes conflict to barf on startup
as it now got two configuration files (the one from the console package
and its own).

This patch resolves the issue. The patch also removes a couple of
unused and obsolete files from the srm client's conf directory
and removes the conf directory from the class path.

We may eventually port the srm client to use the console package, but
that is left for a future patch.

Target: trunk
Require-notes: yes
Require-book: no
Request: 2.10
Request: 2.9
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: https://rb.dcache.org/r/7311/
(cherry picked from commit d045b3c2d95b729cf75eae0b114b16b2ef3b30c3)
Merge pull request #843 from gbehrmann/fix/2.10/rb7311

srm-client: Fix logback configuration