Removed certbot from build image

config/litespeed/1.6.4.build/Dockerfile

@@ -9,10 +9,5 @@ RUN apt-get install $extensions -y
 #    add-apt-repository 'deb http://ftp.debian.org/debian jessie-backports main' && \
 #    apt-get update && apt-get install -y python-certbot-apache -t jessie-backports
 
-RUN apt-get install -y software-properties-common && \
-    add-apt-repository universe && \
-    add-apt-repository ppa:certbot/certbot && \
-    apt-get update && \
-    apt-get install -y certbot python-certbot-apache