create CA private key if not found

cam/ca.py

@@ -97,11 +97,18 @@ class CA(object):
 
         self._update_config()
 
+        # Generate keys if they do not exist.
+        if not os.path.exists(self.files.private_key):
+            log.info('creating new RSA private key')
+            openssl_wrap.run('genrsa', '-des3',
+                '-out', self.files.private_key,
+                self.config['bits'])
+
         # Generate keys if they do not exist.
         if not os.path.exists(self.files.public_key):
             tmpdir = tempfile.mkdtemp()
             csr_file = os.path.join(tmpdir, 'ca.csr')
-            log.info('creating new RSA CA CSR')
+            log.info('creating new temporary RSA CA CSR')
             openssl_wrap.run_with_config(
                 self.basedir, self.files.conf,
                 'req', '-new',