(maint) Update Debian dependencies for new debian-testing packages

In the Debian 'testing' release, the libopenssl-ruby virtual package has been
replaced with the libopenssl-ruby1.9.1 virtual package. The control
file for Debian packages has been updated to reflect this.
Merge pull request #2433 from mckern/stable

(maint) Update Debian dependencies for new debian-testing packages