change version to 1.0.0.alpha2 in configure.ac

configure.ac

 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_INIT([lxc], [1.0.0.alpha1])
+AC_INIT([lxc], [1.0.0.alpha2])
 
 AC_CONFIG_SRCDIR([configure.ac])
 AC_CONFIG_AUX_DIR([config])