fixes #3
fixes #3

copies (eg) /etc/icinga2 to /etc/icinga2_copy during build.
during run, /bin/firstboot tests if /etc/icinga2 is empty
and if it is, copies /etc/icinga2_copy/. to /etc/icinga2
also does /etc/icingaweb2 /var/lib/icinga2 /etc/icinga2-classicui

whatwedo/docker-base-images,whatwedo/docker-base-images