AutoInstallRules.rb - read the installed system properties from "content" file
added test
changes

- 3.1.66
CPE contains percent encoded ':', no escaping needed
use correct "content" tag
added buildrequires needed to run the tests
code review updates
Merge pull request #87 from yast/fix_rules_probing

Fixed product probing when evaluating rules/rules.xml file
Merge branch 'SLE-12-GA'