Renamed the parameters.

Renamed signature_public_file to signature_certificate_file, because the
name is cleaner once the content of the file is a X509 certificate
file. It is also known as Public Key Certificate.

Renamed signature_private_file to signature_private_key_file, because
the is is cleaner once the content of the file is a private RSA key.

slapos/signature.py

@@ -19,7 +19,7 @@ import argparse
 import sys
 
 
-def createPrivateKeyAndCertificateFile(signature_public_file, signature_private_file, **kw):
+def createPrivateKeyAndCertificateFile(signature_certificate_file, signature_private_key_file, **kw):
   ''' It must create a private key and a certificate file. '''
   cur_time = M2Crypto.ASN1.ASN1_UTCTIME()
   cur_time.set_time(int(time.time()) - 60*60*24)
@@ -49,21 +49,21 @@ def createPrivateKeyAndCertificateFile(signature_public_file, signature_private_
   cs_cert.sign(cs_pk, md="sha256")
 
   # Saving...
-  cs_cert.save_pem(signature_public_file)
-  cs_rsa.save_pem(signature_private_file, None)
+  cs_cert.save_pem(signature_certificate_file)
+  cs_rsa.save_pem(signature_private_key_file, None)
   return cs_cert.as_text()
 
 
 def parseArgument(*args):
   ''' Parses command line arguments. '''
   parser = argparse.ArgumentParser()
-  parser.add_argument('--signature-public-file',
+  parser.add_argument('--signature-certificate-file',
                       default='public.pem',
-                      help='Signature public file.')
+                      help='X509 Cetification file.')
 
-  parser.add_argument('--signature-private-file',
+  parser.add_argument('--signature-private-key-file',
                       default='private.pem',
-                      help='Signature private file.')
+                      help='Signature private key file.')
 
   parser.add_argument('-c','--country',
                       default='XX',