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The /var/run directory can be a tmpfs mount, so even if we make it at
install time (or include it in the package) it can go away. Therefore,
test for its existence and create it in the startup script.

Reviewed-by: imsnah

Reviewed-By: imsnah

Reviewed-by: schreiberal

- Add Makefile in doc/examples/

Reviewed-by: schreiberal

Reviewed-by: imsnah

  - move the master node name from the ConfigWriter to SimpleStore (all
    nodes need this, and it was the only thing pulled in from the
    ConfigWriter on nodes)
  - fix mcpu.py and the testing w.r.t. this change; for testing, rename
    the fake_config.py to mocks.py and add a FakeSStore object
  - then add a ganeti-master script which can be run on any node at boot
    and which will not do anything if not master on start (on stop it
    will still try to remove the ip address)
  - also add a new cluster-wide variable (master_netdev) that determines
    on which interface we add this ip address; it's customizable at
    cluster init time
  - also remove the cluster name file which was separately handled from
    ssconf (not needed anymore)
  - remove the master init.d links from the list of config files as this
    is not our responsibility now

Reviewed-by: iustinp