Avoid setting RUST_LOG to the empty string (#5338)

net/remote/remote-client.sh

@@ -8,11 +8,12 @@ echo "$(date) | $0 $*" > client.log
 deployMethod="$1"
 entrypointIp="$2"
 clientToRun="$3"
-RUST_LOG="$4"
+if [[ -n $4 ]]; then
+  export RUST_LOG="$4"
+fi
 benchTpsExtraArgs="$5"
 benchExchangeExtraArgs="$6"
 clientIndex="$7"
-export RUST_LOG=${RUST_LOG:-solana=info} # if RUST_LOG is unset, default to info
 
 missing() {
   echo "Error: $1 not specified"