reintroduce wait_for_pxe_state to fix node state transistions

This function was added in the branch release/essex-hack-suse/master.
As the node state transitions break with slow admin nodes, we need to
wait for the next state to be set in the pxe configuration
Merge pull request #173 from jdsn/release/pebbles/master-wait-for-pxe

reintroduce wait_for_pxe_state to fix node state transistions with slow admin nodes
Revert "reintroduce wait_for_pxe_state to fix node state transistions"

This reverts commit eff468bbb9658635f4737db7c0cdbdc82999959a
which should not have been merged - see:

  https://github.com/crowbar/barclamp-provisioner/pull/173
Merge pull request #176 from aspiers/revert-essex-hack-suse-wait-for-pxe-state

Revert "reintroduce wait_for_pxe_state to fix node state transistions".

Merging without smoke-test since simply returns repo to previous state.
fix typos
coding style: spaces around =
add support for autoyast installation using external SMT server
add support for ssh access during autoyast