* remove node_extension_call from everywhere Nailgun
core source code
* remove volume_manager Node property (models)
* moved volume and disk releated data manipulations to
volume manager extension pipeline
* removed no longer valid tests
* added new extension callback for pre deployment check
* fix some tests
* moved volume_manger specific tests to volume_manger module
* marked 'skip test' to some tests which are no longer
valid in current places but they valuable and should be moved
to volume_manager module in next patches
implements: blueprint data-pipeline
Change-Id: I8edd25166e5eccf914eb92882b6b4a7b3fff6a89
5d1d1fe960