Fixed bugs in naming conventions of packages.

Fixed bugs in naming conventions of packages.

In yang-data-util changed package name from
org.opendaylight.controller.data.util to
org.opendaylight.controller.yang.data.util;
In yang-model-api changed package name from
org.opendaylight.controller.model.api.type to
org.opendaylight.controller.yang.model.api.type;
In yang-model-util changed package name from
org.opendaylight.controller.model.util to
org.opendaylight.controller.yang.model.util;

Added junit test for resolving Yang types from multiple Yang modules;
Fixed typo in QName of Uint64.java to uint64 QName;

Refactored and updated all imports dependant on projects
yang-model-util, yang-model-api and yang-model-util

Change-Id: I13779030a9823a821fc06d5b9a90e195da3e0a1a
Signed-off-by: lsedlak <lsedlak@cisco.com>