(MODULES-1570) java_version fact

Adapted from the many found on Github, simply runs `java -version` and strips the results. From what I can find there aren't many edge cases for the result `java -version 2>&1` could return, so this should be fairly compatible.

lib/facter/java_version.rb

@@ -0,0 +1,19 @@
+# Fact: java_version
+#
+# Purpose: store java versions in the config DB
+#
+# Resolution:
+#   Tests for presence of java, returns nil if not present
+#   returns output of "java -version" and splits on \n + '"'
+#
+# Caveats:
+#   none
+#
+# Notes:
+#   None
+Facter.add(:java_version) do
+  setcode do
+    t_java = Facter::Util::Resolution.exec("java -version 2>&1")
+    java_version = t_java.to_s.lines.first.strip.split(/version/)[1].gsub(/"/, "").strip
+  end
+end