Fix postgresql distribution config in docker files

msa/tb/docker-cassandra/Dockerfile

@@ -18,7 +18,7 @@ FROM thingsboard/openjdk8
 
 RUN apt-get update
 RUN apt-get install -y curl nmap procps
-RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' | tee --append /etc/apt/sources.list.d/pgdg.list > /dev/null
+RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ sid-pgdg main' | tee --append /etc/apt/sources.list.d/pgdg.list > /dev/null
 RUN curl -L https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
 RUN echo 'deb http://www.apache.org/dist/cassandra/debian 311x main' | tee --append /etc/apt/sources.list.d/cassandra.list > /dev/null
 RUN curl -L https://www.apache.org/dist/cassandra/KEYS | apt-key add -

msa/tb/docker-postgres/Dockerfile

@@ -18,7 +18,7 @@ FROM thingsboard/openjdk8
 
 RUN apt-get update
 RUN apt-get install -y curl
-RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' | tee --append /etc/apt/sources.list.d/pgdg.list > /dev/null
+RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ sid-pgdg main' | tee --append /etc/apt/sources.list.d/pgdg.list > /dev/null
 RUN curl -L https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
 ENV PG_MAJOR 11
 RUN apt-get update