several 'required' flags added to jdl and re-import

.jhipster/Asset.json

@@ -37,6 +37,7 @@
             "relationshipType": "many-to-one",
             "otherEntityName": "membership",
             "otherEntityRelationshipName": "asset",
+            "relationshipValidateRules": "required",
             "relationshipName": "member",
             "otherEntityField": "id"
         }

.jhipster/Customer.json

@@ -67,17 +67,17 @@
         }
     ],
     "relationships": [
-        {
-            "relationshipType": "one-to-many",
-            "otherEntityName": "membership",
-            "otherEntityRelationshipName": "customer",
-            "relationshipName": "membership"
-        },
         {
             "relationshipType": "one-to-many",
             "otherEntityName": "customerContact",
             "otherEntityRelationshipName": "customer",
             "relationshipName": "role"
+        },
+        {
+            "relationshipType": "one-to-many",
+            "otherEntityName": "membership",
+            "otherEntityRelationshipName": "customer",
+            "relationshipName": "membership"
         }
     ],
     "changelogDate": "20190403083735",

.jhipster/Membership.json

@@ -30,6 +30,7 @@
             "relationshipType": "many-to-one",
             "otherEntityName": "customer",
             "otherEntityRelationshipName": "membership",
+            "relationshipValidateRules": "required",
             "relationshipName": "customer",
             "otherEntityField": "prefix"
         }

.jhipster/Share.json

@@ -37,6 +37,7 @@
             "relationshipType": "many-to-one",
             "otherEntityName": "membership",
             "otherEntityRelationshipName": "share",
+            "relationshipValidateRules": "required",
             "relationshipName": "member",
             "otherEntityField": "id"
         }