slapos-master: delete custom instance-erp5.cfg.in

Historically, a custom `instance-erp5.cfg.in` was required for SlapOS Master in order to install
the SlapOS configurator. This required changing the default business templates, which can, since
49a7f256, be done using a custom build section.

This commit updates the `software.cfg` file accordingly, and deletes the legacy
`instance-erp5.cfg.in` file, which is not needed anymore, to instead use the file provided in
`stack/erp5`.

/cc @rafael

software/slapos-master/buildout.hash.cfg

@@ -12,10 +12,6 @@
 # Substitution (${...:...}), extension ([buildout] extends = ...) and
 # section inheritance (< = ...) are NOT supported (but you should really
 # not need these here).
-[template-erp5]
-filename = instance-erp5.cfg.in
-md5sum = 620912069597ea748d55cb68790fa270
-
 [template-balancer]
 filename = instance-balancer.cfg.in
 md5sum = 88e15a803df4aa35285e59ae9186438a

software/slapos-master/software.cfg

@@ -17,6 +17,11 @@ repository_id_list += vifib/master
 [erp5]
 branch = erp5-vifib
 
+[default-bt5]
+list =
+  erp5_full_text_mroonga_catalog
+  slapos_configurator
+
 [vifib]
 <= erp5
 repository = https://lab.nexedi.com/nexedi/slapos.core.git
@@ -45,10 +50,6 @@ extra-paths +=
 recipe = slapos.recipe.build:download
 url = ${:_profile_base_location_}/${:filename}
 
-[template-erp5]
-< = download-base-part
-filename = instance-erp5.cfg.in
-
 [template-balancer]
 < = download-base-part
 filename = instance-balancer.cfg.in