MCOL-4012 Related. Run SM as non-root user mysql by default

oam/install_scripts/columnstore-post-install.in

@@ -314,6 +314,7 @@ if [ $? -eq 0 ] && [ $(running_systemd) -eq 0 ]; then
     # prevent clusters using shared storage from initializing columnstore more than once
     IFLAG=/var/lib/columnstore/storagemanager/cs-initialized
     mkdir -p /var/lib/columnstore/storagemanager
+    chown -R mysql:mysql /var/lib/columnstore/storagemanager
 
     if [ ! -e $IFLAG ]; then
        touch $IFLAG

oam/install_scripts/mcs-storagemanager.service.in

@@ -3,5 +3,11 @@ Description=storagemanager
 
 [Service]
 Type=simple
+
+User=mysql
+Group=mysql
+LimitNOFILE=65536
+LimitNPROC=65536
+
 ExecStart=/usr/bin/env bash -c "LD_PRELOAD=$(ldconfig -p | grep -m1 libjemalloc | awk '{print $1}') exec @ENGINE_BINDIR@/StorageManager"
 SuccessExitStatus=255