rename ipaccess-find into abisip-find

The tool is not used only to find ip.access devices, but used to find
any Abis/IP implementing devices, including those supported by OsmoBTS.
diff --git a/debian/osmocom-ipaccess-utils.install b/debian/osmocom-ipaccess-utils.install
index 750641e..de13c18 100644
--- a/debian/osmocom-ipaccess-utils.install
+++ b/debian/osmocom-ipaccess-utils.install
@@ -1,3 +1,3 @@
 /usr/bin/ipaccess-config
-/usr/bin/ipaccess-find
+/usr/bin/abisip-find
 /usr/bin/ipaccess-proxy