Imported templates are not fully validated

Validated First level sections of imported templates,First level
sub-sections of relationship_types and added testcases for the same

Change-Id: I21e8deffa5b3013624bfac62cddc491ebd135b14
Partially-Implements: #1516177

toscaparser/elements/relationshiptype.py

@@ -10,16 +10,25 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from toscaparser.common.exception import ExceptionCollector
+from toscaparser.common.exception import UnknownFieldError
 from toscaparser.elements.statefulentitytype import StatefulEntityType
 
 
 class RelationshipType(StatefulEntityType):
     '''TOSCA built-in relationship type.'''
+    SECTIONS = (DERIVED_FROM, VALID_TARGET_TYPES, INTERFACES,
+                ATTRIBUTES, PROPERTIES, DESCRIPTION, VERSION,
+                CREDENTIAL) = ('derived_from', 'valid_target_types',
+                               'interfaces', 'attributes', 'properties',
+                               'description', 'version', 'credential')
+
     def __init__(self, type, capability_name=None, custom_def=None):
         super(RelationshipType, self).__init__(type, self.RELATIONSHIP_PREFIX,
                                                custom_def)
         self.capability_name = capability_name
         self.custom_def = custom_def
+        self._validate_keys()
 
     @property
     def parent_type(self):
@@ -31,3 +40,10 @@ class RelationshipType(StatefulEntityType):
     @property
     def valid_target_types(self):
         return self.entity_value(self.defs, 'valid_target_types')
+
+    def _validate_keys(self):
+        for key in self.defs.keys():
+            if key not in self.SECTIONS:
+                ExceptionCollector.appendException(
+                    UnknownFieldError(what='Relationshiptype "%s"' % self.type,
+                                      field=key))

toscaparser/tests/data/custom_types/imported_sample.yaml

@@ -32,3 +32,7 @@ policy_types:
      type: map
      entry_schema:
        type: string
+relationship_types1:
+relationship_types:
+  test.relation.connects:
+    derived_from4: tosca.relationships.ConnectsTo

toscaparser/tests/data/tosca_imports_validation.yaml

@@ -37,3 +37,9 @@ topology_template:
         metadata:
           user1: 1001
           user2: 1003
+ relationship_templates:
+    my_custom_rel:
+      type: test.relation.connects
+      interfaces:
+        Configure:
+          pre_configure_source: scripts/wp_db_configure.sh

toscaparser/tests/test_toscatplvalidation.py

@@ -97,6 +97,11 @@ class ToscaTemplateValidationTest(TestCase):
             _('Policy "mycompany.mytypes.myScalingPolicy" contains unknown '
               'field "derived1_from". Refer to the definition to '
               'verify valid values.'))
+        exception.ExceptionCollector.assertExceptionMessage(
+            exception.UnknownFieldError,
+            _('Relationshiptype "test.relation.connects" contains unknown '
+              'field "derived_from4". Refer to the definition to '
+              'verify valid values.'))
 
     def test_inputs(self):
         tpl_snippet = '''