Rename soy templates to use consistent naming scheme

We use {EPP resource}{action} as the naming scheme everywhere else, so we shoudl do so here too.  It's generally nicer for files to group by type of EPP resource (so all of the domain actions are together) than by type of action.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130955192

java/google/registry/tools/soy/ContactCreate.soy

@@ -16,7 +16,7 @@
 /**
  * Create contact
  */
-{template .createcontact}
+{template .contactcreate}
   {@param? id: string}
   {@param? name: string}
   {@param? org: string}

java/google/registry/tools/soy/DomainCreate.soy

@@ -16,7 +16,7 @@
 /**
  * Create domain
  */
-{template .createdomain}
+{template .domaincreate}
   {@param domain: string}
   {@param? period: string}
   {@param? ns: list<string>}
@@ -53,4 +53,3 @@
     </command>
   </epp>
 {/template}
-