test-cert generation scripts: Remove some dead code.

generate-redundant-test-chains.sh and generate-duplicate-cn-certs.sh contain
some stuff copied from other scripts that isn't actually useful.

BUG=none
R=rsleevi@chromium.org

Review URL: https://codereview.chromium.org/132443005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248660 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248660