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auth/as: fix wrong filesystem permissions due to wrong factotum being attached

to change user, have to (re-)mount factotum under the new user,
so it can authenticate us under the correct user for the filesystems.

--- a/sys/src/cmd/auth/as.c

+++ b/sys/src/cmd/auth/as.c

@@ -38,6 +38,22 @@

 	sysfatal("exec: %s: %r", a[0]);

 }

+int

+mountfactotum(void)

+{

+	int fd;

+

+	/* get a link to factotum as new user */

+	fd = open("/srv/factotum", ORDWR);

+	if(fd < 0)

+		return -1;

+	if(mount(fd, -1, "/mnt", MREPL, "") == -1){

+		close(fd);

+		return -1;

+	}

+	return 0;

+}

+

 void

 main(int argc, char *argv[])

 {

@@ -57,6 +73,10 @@

 	if(becomeuser(argv[0]) < 0)

 		sysfatal("can't change uid for %s: %r", argv[0]);

+

+	if(mountfactotum() < 0)

+		sysfatal("can't mount factotum for uid for %s: %r", argv[0]);

+

 	if(newns(argv[0], namespace) < 0)

 		sysfatal("can't build namespace: %r");