Rename name to type

mdsigner.yaml.example

 ---
 test:
   signer:
-    name: test_signer
+    type: test_signer
     key_spec: meta.key
     cert_spec: meta.crt
   metadir: metadata/test
 foobar:
   signer:
-    name: hsm_signer
+    type: hsm_signer
     key_spec: pkcs11:///usr/lib/softhsm/libsofthsm2.so/test?pin=secret
   metadir: metadata/foobar

signers.py

@@ -31,9 +31,9 @@ _signers = {
 
 class Signers():
     def __init__(self, signer):
-        self.name = signer['name']
+        self.type = signer['type']
         self.key_spec = signer['key_spec']
         self.cert_spec = signer.get('cert_spec', None)
 
     def sign(self, xml):
-        return _signers[self.name](xml, self.key_spec, self.cert_spec)
+        return _signers[self.type](xml, self.key_spec, self.cert_spec)