Added file omitted during previous commit

cloudbridge/cloud/base/helpers.py

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+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import serialization as crypt_serialization
+from cryptography.hazmat.primitives.asymmetric import rsa
+
+
+def generate_key_pair():
+    """
+    This method generates a keypair and returns it as a tuple
+    of (public, private) keys.
+    The public key format is OpenSSH and private key format is PEM.
+    """
+    key_pair = rsa.generate_private_key(
+        backend=default_backend(),
+        public_exponent=65537,
+        key_size=2048)
+    private_key = key_pair.private_bytes(
+        crypt_serialization.Encoding.PEM,
+        crypt_serialization.PrivateFormat.PKCS8,
+        crypt_serialization.NoEncryption()).decode('utf-8')
+    public_key = key_pair.public_key().public_bytes(
+        crypt_serialization.Encoding.OpenSSH,
+        crypt_serialization.PublicFormat.OpenSSH).decode('utf-8')
+    return public_key, private_key