CTS: Create test for DISALLOW_INSTALL_UNKNOWN_SOURCES

Added a new CTS app - PackageInstaller to test installing apk in a non
device owner package under policy restrictions

Note:
UserRestrictionActivity is copied from ManagedProfileTest

Bug: 18928535
Change-Id: I4fced5b345c4594009203681501ad84079dd3c61
diff --git a/CtsTestCaseList.mk b/CtsTestCaseList.mk
index cf7da2f..41f9dc3 100644
--- a/CtsTestCaseList.mk
+++ b/CtsTestCaseList.mk
@@ -100,6 +100,7 @@
     CtsManagedProfileApp \
     CtsMonkeyApp \
     CtsMonkeyApp2 \
+    CtsPackageInstallerApp \
     CtsPermissionApp \
     CtsSimpleApp \
     CtsSimplePreMApp \