tools: rename source for virt-login-shell

We'll shortly be renaming the binary to virt-login-shell-helper
and introducing a new tool as virt-login-shell. Renaming the
source file first gives a much more usefull diff for the next
commit.
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

tools/Makefile.am

@@ -198,7 +198,7 @@ virt_host_validate_CFLAGS = \
 # This we statically link to a library containing only the minimal
 # libvirt client code, not libvirt.so itself.
 virt_login_shell_SOURCES = \
-		virt-login-shell.c
+		virt-login-shell-helper.c
 
 virt_login_shell_LDFLAGS = \
 		$(AM_LDFLAGS) \

tools/virt-login-shell.c → tools/virt-login-shell-helper.c

 /*
- * virt-login-shell.c: a shell to connect to a container
+ * virt-login-shell-helper.c: a shell to connect to a container
  *
  * Copyright (C) 2013-2014 Red Hat, Inc.
  *