Update to ad_plfs code for MPICH2
Merge branch 'master' of github.com:plfs/plfs-core
Updated Container.cpp to not use the default random number generator for
the open code. This will avoid rand() pollution and increase parallelism
on open with a large N-1 file with many procs.
Merge pull request #300 from thewacokid/master

This passed all regression tests as well as spot-checks with up to 512 cores.