CFY-1229 created openstack keypair type
CFY-1229 fixed keypair type declaration in plugin.yaml; fixed expanduser bug; fixed bug in deleting private key; added deletion after error in writing the private key on keypair creation, for atomicity of the 'create' operation
CFY-1229 created relationship between server and keypair
Merge branch 'master' into CFY-1229-openstack-keypair-type
CFY-1229 updated plugin yaml according to new interface spec
CFY-1229 flake8 fix
CFY-1229 fixed method name
Merge pull request #27 from cloudify-cosmo/CFY-1229-openstack-keypair-type

CFY 1229 openstack keypair type