rkerberos: bump to rebuild for i386 too
Jenkins job now calls pbuilder with the 32-bit chroot too whenArchitecture is set to "any" in the control file.
Remove libkrb5* transitional packages from rkerberos
libkrb5-ruby* are part of ruby-krb5-auth in Debian main, and while rkerberosis the successor to krb5-auth, claiming to replace the packages causesconflicts as version numbers aren't equivalent.
Add specs for Ubuntu 14.04 LTS (aka trusty tahr)