Recompile any old perl modules after perl upgrade
Recompile any old perl modules after perl upgrade

Whenever perl is upgraded, it is a good idea to clean out any old
modules and recompile them. This check ensures that perl-cleaner is run
once and only once after each major perl upgrade.

BUG=chromium-os:19244
TEST=Run preflight queue with perl upgrade and old sdk. Verify that old
     perl modules are removed in the first run. Verify perl-cleaner is
     not run again in subsequent runs. Run sdk builder and confirm sdk
     builder runs perl-cleaner every time since it starts with an old
     version of perl.

Change-Id: Ib14f9d73122d5ff2c7a23afc3f56905e30ff2cbc
Reviewed-on: http://gerrit.chromium.org/gerrit/6149
Reviewed-by: Anush Elangovan <be3ea4b32dfea400cfb02e20cf45a400ef235334@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

vmware/coreos-scripts,zhang0137/scripts,nicescale/scripts,glevand/coreos--scripts,nicescale/scripts,mischief/scripts,fivethreeo/scripts,sigma/coreos-scripts,bcwaldon/coreos-scripts,mischief/scripts,trnubo/scripts,mjg59/scripts,vmware/coreos-scripts,marineam/coreos-scripts,gtank/scripts,crawford/scripts,crawford/scripts,marineam/coreos-scripts,andrejro/coreos--scripts,zhang0137/scripts,BugRoger/scripts,smilart/scripts,coreos/scripts,endocode/scripts,andrejro/coreos--scripts,gtank/scripts,sigma/coreos-scripts,smilart/scripts,zhang0137/scripts,fivethreeo/scripts,endocode/scripts,bcwaldon/coreos-scripts,fivethreeo/scripts,mjg59/scripts,trnubo/scripts,crawford/scripts,nicescale/scripts,coreos/scripts,bcwaldon/coreos-scripts,mischief/scripts,sigma/coreos-scripts,smilart/scripts,BugRoger/scripts,andrejro/coreos--scripts,endocode/scripts,trnubo/scripts,gtank/scripts,glevand/coreos--scripts,vmware/coreos-scripts,marineam/coreos-scripts,mjg59/scripts,BugRoger/scripts