targetloader.py: drop test for ClassType

ClassType was removed from python3.
The code testing for ClassType kept throwing AttributeError exceptions:

    module 'types' has no attribute 'ClassType'

The exceptions prevented loading of any dynamically resolved target
controllers.

(From OE-Core rev: d62f18c39bc0ed3b0f5ac8465b393c15f2143ecf)

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/controllers/testtargetloader.py

@@ -61,8 +61,6 @@ class TestTargetLoader:
             obj = getattr(module, target)
             if obj: 
                 from oeqa.targetcontrol import BaseTarget
-                if (not isinstance(obj, (type, types.ClassType))):
-                    bb.warn("Target {0} found, but not of type Class".format(target))
                 if( not issubclass(obj, BaseTarget)):
                     bb.warn("Target {0} found, but subclass is not BaseTarget".format(target))
         except: