[engine] MuranoPL polymorphism does not work is upcasted to superclass

[Alexander Tivelkov]

If some derived class executes the method of its superclass (using $.super($.someMethod)), and that method attempts to call some virtual method (e.g. a method overridden in the derived class), then polymorphism does not work: a base version of method is executed instead of derived one

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/94144

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/94144
Committed: https://git.openstack.org/cgit/stackforge/murano/commit/?id=c6b5887c754b9d97f578a6e37587571d3e387823
Submitter: Jenkins
Branch: master

commit c6b5887c754b9d97f578a6e37587571d3e387823
Author: Stan Lagun <email address hidden>
Date: Mon May 19 11:25:18 2014 +0400

    Restore identity of upcasted MPL object on method call

    When base class method was invoked using case/super method
    polymorphic method resolution mechanism didn't worked as
    expected. Now object identity is restored after DSL finds
    base class method and polymorphic calls work as they should

    Change-Id: I670ffaf5b28a60a3d269e85d25e0dfc7e164ee15
    Closes-Bug: #1314618