Set ownership correctly for plugins in netdata-installer.sh (#7923)

netdata-installer.sh

@@ -731,6 +731,7 @@ if [ "${UID}" -eq 0 ]; then
   run chown -R "root:${admin_group}" "${NETDATA_PREFIX}/usr/libexec/netdata"
   run find "${NETDATA_PREFIX}/usr/libexec/netdata" -type d -exec chmod 0755 {} \;
   run find "${NETDATA_PREFIX}/usr/libexec/netdata" -type f -exec chmod 0644 {} \;
+  run find "${NETDATA_PREFIX}/usr/libexec/netdata" -type f -a -name \*.plugin -exec chown :${NETDATA_GROUP} {} \;
   run find "${NETDATA_PREFIX}/usr/libexec/netdata" -type f -a -name \*.plugin -exec chmod 0750 {} \;
   run find "${NETDATA_PREFIX}/usr/libexec/netdata" -type f -a -name \*.sh -exec chmod 0755 {} \;