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The previous approach (using the return value from
os.system for sys.exit) was false. For more information, see
`how-to-bypass-the-0-255-range-limit-for-sys-exit-in-python'
on stackoverflow.

snf-deploy uses os.system to execute it's fabfile. We have
to use sys.exit() for the python script to return with the
same exit code as the one returned by fabric script.

When creating new ssh keys if the key already exists,
ssh-keygen prompts the user if he want to overwrite it.
To avoid prompting the user, delete all the old keys,
before generating new ones (the user has
to use the --force option for this to happen).

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

Remove ssh keys from snf-deploy package.
We can now generate new keys running `snf-deploy keygen'.

Use snf-manage service-export and service-import management commands to
import services and corresponding resources to astakos. Also, remove old
temporary files that were used for this procedure.

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

This skips key injection in nodes
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

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

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