Stop running TB2 tests on Safari 5 and Opera 12

While still supported, these browsers are completely outdated and the
tests no longer give us meaningful information. When TestBench 2 tests
are converted to TB4, they will no longer be run on either of these browser.

To improve the situation in the future, TB4 tests should be run on
Safari 7 and latest Opera

Change-Id: Ib49376e30e105aea89218aa352c44a4c3ec8778f

uitest/test.xml

@@ -7,7 +7,7 @@
     <!-- Configuration -->
     <!-- ================================================================== -->
     <!-- Browsers to use for testing -->
-    <property name="browsers-windows" value="winxp-ie8,win7-ie9,win7-ie10,winxp-firefox17-esr,winxp-safari5,winxp-googlechrome21,winxp-opera12" />
+    <property name="browsers-windows" value="winxp-ie8,win7-ie9,win7-ie10,winxp-firefox17-esr,winxp-googlechrome21" />
     <property name="browsers-linux" value="linux-firefox3,linux-opera10,linux-googlechrome8" />
     <property name="browsers-mac" value="osx-firefox3,osx-opera10,osx-googlechrome8,osx-safari4,osx-safari5" />