bkernel: drop nosync here too and fix logic to not change site-defaults in kojibuilder role

This caused a bit of trouble since I disabled nosync in the kojibuilder
role. I think applied that with -t site-defaults, which updated
everything, _including_ bkernel machines. Sadly, bkernel machines have
additional config in site-defaults to allow for secure boot signing and
this was lost. So, make sure only the bkernel role changes site-defaults
on bkernel machines and also drop nosync from it's private config.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/bkernel/files/bkernel-site-defaults.cfg

@@ -2,8 +2,8 @@
 config_opts['plugin_conf']['bind_mount_opts']['dirs'].append(('/var/run/pesign', '/var/run/pesign' ))
 config_opts['plugin_conf']['package_state_enable'] = False
 config_opts['macros']['%bugurl'] = 'https://bugz.fedoraproject.org/%name'
-config_opts['nosync'] = True
-config_opts['nosync_force'] = True
+#config_opts['nosync'] = True
+#config_opts['nosync_force'] = True
 config_opts['dnf_common_opts'] = ['--setopt=install_weak_deps=0']
 config_opts['environment']['LANG'] = 'C.UTF-8'
 config_opts['use_bootstrap'] = False

roles/koji_builder/tasks/main.yml

@@ -264,6 +264,7 @@
 
 - name: mock site-defaults.cfg
   template: src=builders/site-defaults.cfg dest=/etc/mock/site-defaults.cfg mode=0644 owner=root group=mock
+  when: not inventory_hostname.startswith(('bkernel'))
   tags:
   - koji_builder
   - site-defaults