Remove code that extends slice lifetime, and fix underlying bug.

We currrently have a few cases where a slice record exists, but
no sliver, and so Renew was failing. Since we store all of the
expiration in the slice record, we do not actually need to have
an aggregate, so remove the check.

protogeni/lib/GeniCMV2.pm.in

@@ -1251,9 +1251,9 @@ sub RenewSlice($)
     return $slice
 	if (defined($slice) && GeniResponse::IsResponse($slice));
 
-    if (! (defined($slice) && defined($aggregate))) {
+    if (! defined($slice)) {
 	return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
-				    "No slice or aggregate here");
+				    "No such slice here");
     }
     main::AddLogfileMetaDataFromSlice($slice);
     
@@ -2359,24 +2359,6 @@ sub Credential2SliceAggregate($)
 	    return (GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
 				 "Duplicate slice URN already exists here"));
 	}
-	my $cred_expires = str2time( $credential->expires() );
-	my $slice_expires = str2time( $slice->expires() );
-
-	if( $cred_expires > $slice_expires ) {
-	    # The credential presented lasts longer than we thought the
-	    # slice did: our expiry date must have been stale.  This can
-	    # happen because the SA is always free to extend the lifetime
-	    # of a slice, and is not required to tell us.
-	    #
-	    # This is important, because we use the slice expiry time
-	    # for a whole bunch of validity checks.  Requiring the user
-	    # to renew their sliver is not sufficient, because they might
-	    # not even HAVE a sliver (and if we don't keep the slice
-	    # expiry time right, they might not have permission to create
-	    # one, either).
-	    print STDERR "Changing expiration from $slice_expires to $cred_expires\n";
-	    $slice->SetExpiration( $cred_expires );
-	}
 	$aggregate = GeniAggregate->SliceAggregate($slice);
     }
     else {