debian: Use link files for postgresql conf files

This work is part of debian integration effort.
This focuses on new deployments.
There will be a task to handle upgrades.

Configuration for postgres now points to files outside
/etc/postgresql. When copying files from drbd, create links to the
real location.

Tests on AIO-SX:
Debian:
PASS: unlocked enabled available
CentOS:
Skip full test, but run snippet to prove it is just a refactor

Tests on AIO-DX:
Debian:
Can't test, integration not far enough
CentOS:
Skip test, infer from AIO-SX it is just a refactor

Depends-On: https://review.opendev.org/c/starlingx/ansible-playbooks/+/841305
Depends-On: https://review.opendev.org/c/starlingx/stx-puppet/+/840468
Story: 2009965
Task: 45390
Signed-off-by: Dan Voiculeasa <dan.voiculeasa@windriver.com>
Change-Id: I6243c96d55ebed52f57be8f9e9647d08098f0893

controllerconfig/controllerconfig/scripts/controller_config

@@ -564,7 +564,27 @@ start()
     if [ ! -e "${ACTIVE_CONTROLLER_NOT_FOUND_FLAG}" ]
     then
         mkdir -p /etc/postgresql/
-        cp -p $CONFIG_DIR/postgresql/*.conf /etc/postgresql/
+
+        OS_ID=$(grep '^ID=' /etc/os-release | cut -f2- -d= | sed -e 's/\"//g')
+        if [ ${OS_ID} == "centos" ];
+        then
+            REAL_CONFIG_DIR=/etc/postgresql
+        elif [ ${OS_ID} == "debian" ];
+        then
+            REAL_CONFIG_DIR=/etc/postgresql/13/main
+
+            for f in ${CONFIG_DIR}/postgresql/*.conf ;
+            do
+                link_basename=$(basename ${f})
+                link=/etc/postgresql/${link_basename}
+                echo "Removing ${link} to allow link to be created"
+                rm ${link}
+                echo "Linking ${link} to ${REAL_CONFIG_DIR}/${link_basename}"
+                ln -s ${REAL_CONFIG_DIR}/${link_basename} ${link}
+            done
+        fi
+        cp -p ${CONFIG_DIR}/postgresql/*.conf ${REAL_CONFIG_DIR}/
+
         if [ $? -ne 0 ]
         then
             fatal_error "Unable to copy .conf files to /etc/postgresql"