fix: set autoconf package name to babeltrace2

This will help to make sure we are co-installable with babeltrace 1 by
moving the documentation directory to '/usr/share/doc/babeltrace2'.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Change-Id: Ia55d2049967016fc5a00594c928e0f2c4f0e477d
Reviewed-on: https://review.lttng.org/c/babeltrace/+/2858
Reviewed-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

configure.ac

@@ -33,7 +33,7 @@ m4_define([bt_version_dev_stage], [])
 m4_define([bt_version], bt_version_major[.]bt_version_minor[.]bt_version_patch[]bt_version_dev_stage)
 m4_define([bt_version_name], [Amqui])
 
-AC_INIT([babeltrace], bt_version, [jeremie dot galarneau at efficios dot com], [], [https://efficios.com/babeltrace/])
+AC_INIT([babeltrace2], bt_version, [jeremie dot galarneau at efficios dot com], [], [https://efficios.com/babeltrace/])
 AC_PROG_SED
 
 # Following the numbering scheme proposed by libtool for the library version