context.py: avoid skipping tests by meaningless command argument

Currently `oe-selftest -R a' will skip 'archiver' tests. This is
not expected. Fix it so that the '-R' should be followed by actual
module/class/test names.

(From OE-Core rev: de3b070fc2ddd0b63a324679ec5adbe30142fc22)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/context.py

@@ -52,7 +52,7 @@ class OETestContext(object):
             return func
         for test in self.suites:
             for skip in skips:
-                if test.id().startswith(skip):
+                if (test.id()+'.').startswith(skip+'.'):
                     setattr(test, 'setUp', skipfuncgen('Skip by the command line argument "%s"' % skip))
 
     def loadTests(self, module_paths, modules=[], tests=[],