findNestingForm() tests only against component family and against instanceof UIForm

since we ran into issues with some FormComponents which extend
UIForm, but override the Family we should add an instanceof to
the findNestingForm() method.

Currently we test if the Form is a member of the following families:

"javax.faces.Form"
"org.apache.struts.faces.Form"
"org.apache.myfaces.trinidad.Form"
"oracle.adf.Form"

Since there are more and more coming "custom" JSF libs which may
extend UIForm, but override the family (like Struts-Faces did) I think
we should add an instanceof UIForm to the algor.

Testing against the families:
"org.apache.myfaces.trinidad.Form"
"oracle.adf.Form"

makes sense because they are not UIForms. These form are also not a
naming container.