allows private addresses if not public network (#20178)

(cherry picked from commit c4f2e5f88c)

# Conflicts:
#	net/net.sh

Co-authored-by: behzad nouri <behzadnouri@gmail.com>

net/common.sh

@@ -69,6 +69,7 @@ loadConfigFile() {
     entrypointIp=${validatorIpList[0]}
   else
     entrypointIp=${validatorIpListPrivate[0]}
+    maybeAllowPrivateAddr='--allow-private-addr'
   fi
 
   buildSshOptions

net/net.sh

@@ -910,6 +910,8 @@ while [[ -n $1 ]]; do
       extraPrimordialStakes=$2
       shift 2
     elif [[ $1 = --allow-private-addr ]]; then
+      # May also be added by loadConfigFile if 'gce.sh create' was invoked
+      # without -P.
       maybeAllowPrivateAddr="$1"
       shift 1
     elif [[ $1 = --accounts-db-skip-shrink ]]; then