Do not attempt to create solana user multiple times (#5228)

* Do not attempt to create solana user multiple times

net/scripts/create-solana-user.sh

@@ -4,6 +4,9 @@ set -ex
 [[ $(uname) = Linux ]] || exit 1
 [[ $USER = root ]] || exit 1
 
+if grep -q solana /etc/passwd ; then
+  echo "User solana already exists"
+else
   adduser solana --gecos "" --disabled-password --quiet
   adduser solana sudo
   adduser solana adm
@@ -26,4 +29,4 @@ sudo -u solana bash -c "
       StrictHostKeyChecking no
     \" > config
   "
-
+fi