[trac1018] logging checking code and spec weren't installed

src/bin/cfgmgr/plugins/Makefile.am

@@ -4,3 +4,4 @@ EXTRA_DIST += logging.spec b10logging.py
 
 config_plugindir = @prefix@/share/@PACKAGE@/config_plugins
 config_plugin_DATA = tsig_keys.py tsig_keys.spec
+config_plugin_DATA = b10logging.py logging.spec