Synnefo

More pep8 fixes related to snf-deploy

Those fixes concern errors that are introduced in latest
pep8 version (and not the wheezy's one).

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Huuuuge snf-deploy refactor

Introduce the concept of Roles and Components.

Roles are ns, mq, db, nfs, astakos, cyclades, pithos, cms, stats,
ganeti, master, and client.

Each role consists of various SynnefoComponents which should define:

• commands to check installation prerequisites (check)...