Remove per-domain nameserver restrictions in reserved lists

This also removes the related setting on the Registry entity. We never used
either of these, and keeping them around in our codebase just adds complexity
for no purpose. We already achieve the goals of this feature by restricting
nameservers on entire TLDs and by registry-locking important domain names.

This is also two fewer things we'll have to worry about carrying over to the new
schema in Registry 3.0.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=243816241

java/google/registry/tools/CreateOrUpdateTldCommand.java

@@ -197,14 +197,6 @@ abstract class CreateOrUpdateTldCommand extends MutatingCommand {
       description = "Override restrictions on reserved list naming")
   boolean overrideReservedListRules;
 
-  @Nullable
-  @Parameter(
-    names = {"--domain_create_restricted"},
-    description = "If only domains with nameserver restricted reservation can be created",
-    arity = 1
-  )
-  Boolean domainCreateRestricted;
-
   @Nullable
   @Parameter(
       names = "--claims_period_end",
@@ -331,7 +323,6 @@ abstract class CreateOrUpdateTldCommand extends MutatingCommand {
       Optional.ofNullable(tldType).ifPresent(builder::setTldType);
       Optional.ofNullable(lordnUsername).ifPresent(u -> builder.setLordnUsername(u.orElse(null)));
       Optional.ofNullable(claimsPeriodEnd).ifPresent(builder::setClaimsPeriodEnd);
-      Optional.ofNullable(domainCreateRestricted).ifPresent(builder::setDomainCreateRestricted);
       Optional.ofNullable(numDnsPublishShards).ifPresent(builder::setNumDnsPublishLocks);
 
       if (premiumListName != null) {