Make the default JVM heap size for Solr less aggressive

The default value is now the smaller of two values:

* 25% of total system memory
* 1024 MB
Merge branch 'less-aggressive-solr-tuning'
Bump Chef Server's embedded chef-solo to final 11.0.0 release version.
Merge branch 'chef-server-embedded-chef-release-version'
A few final tweaks for the release matrix:

* We now test Ubuntu 12.04 builds on Ubuntu 12.10.
* Remove 32-bit publishing of 32-bit builds.
Merge branch 'chef-server-release-matrix-tweaks'