Fix docker dns modification

Enhance step purge

seqs/onlyoffice.sh

@@ -13,7 +13,7 @@ dockerGpgKeyUrl="https://download.docker.com/linux/ubuntu/gpg"
 dockerRepoUrl="https://download.docker.com/linux/ubuntu"
 dockerPackages="docker-ce docker-ce-cli containerd.io"
 # Entry in config value $dockerDefaultConf
-dockerDnsEntry="DOCKER_OPTS=\"--dns $dockerDns1 --dns $dockerDns2\""
+dockerDnsEntry=
 
 # Get script working directory
 # (when called from a different directory)
@@ -32,6 +32,7 @@ step_config() {
     echoerr " [W] User configuration \"$CONFIG_FILE\" not found. Using \"$CONFIG_FILE_DEFAULT\""
     . "$CONFIG_FILE_DEFAULT"
   fi
+  dockerDnsEntry="DOCKER_OPTS=\"--dns $dockerDns1 --dns $dockerDns2\""
 }
 
 step_1_info() { echo "Install Docker dependencies"; }
@@ -162,7 +163,8 @@ step_102_alias() { ALIAS="purge"; }
 step_102() {
   exe read -p "Are you sure y/[n]? " answer
   case $answer in
-    yY)
+    [yY])
+      exe service docker stop
       exe rm -rf /var/lib/docker 
       ;;
     *)