deal with gnupg 1.2.5 python-psutil == 1.2.1 pinning

Should lookup the reason of the psutil pinning to 1.2.1 pinning. backport if needed, or maybe relax the pinning if other versions are good enough for our needs.

these are the version tables:

 python-psutil | 0.1.2-2        | lucid/universe   | source, all
 python-psutil | 0.4.1-1ubuntu1 | precise/universe | source, amd64, armel, armhf, i386, powerpc
 python-psutil | 0.6.1-1ubuntu1 | quantal/universe | source, amd64, armel, armhf, i386, powerpc
 python-psutil | 0.6.1-2ubuntu1 | raring/universe  | source, amd64, armhf, i386, powerpc
 python-psutil | 0.6.1-2ubuntu1 | saucy/universe   | source, amd64, arm64, armhf, i386, powerpc
 python-psutil | 1.1.3-1ubuntu1 | trusty           | source, amd64, arm64, armhf, i386, powerpc, ppc64el

 python-psutil | 0.1.3-1 | squeeze | source, all
 python-psutil | 0.5.1-1 | wheezy  | source, amd64, armel, armhf, i386, ia64, mips, mipsel, powerpc, s390, s390x, sparc
 python-psutil | 1.1.3-1 | jessie  | source, amd64, armel, armhf, i386, ia64, mips, mipsel, powerpc, s390x, sparc
 python-psutil | 1.1.3-1 | sid     | source, amd64, armel, armhf, i386, ia64, mips, mipsel, powerpc, s390x, sparc

(from redmine: created on 2013-12-23, closed on 2013-12-27, relates #4828 (closed), relates #5489 (closed), relates #5610 (closed), precedes #4712 (closed), precedes #5742 (closed))