core: No param dependency in AsyncTasks' equals

AsyncTasks' equals(Object) and hashCode() rely on
VdcActionParametersBase's equals(Object) and hashCode() (respectively),
which are known to be broken (as the inheriting classes do not override
them).

These methods were removed from VdcActionParametersBase in patch
2d884006f356ca95c6b43a509aa809cc3647552c, which neglected to remove the
dependency from AsyncTasks, breaking the DAO test suite.
This patch remedies that mistake.

Change-Id: Ib3b8ce8f32442732b9a529b2d354803ece1b55f4
Signed-off-by: Allon Mureinik <amureini@redhat.com>