Fix the incorrect use of attribute

The use of get_attribute instead of get_property can fix the issue, but since
the templates were creatd for specific tests as explained in the bug it is
good to clean up clutterd template code.

Change-Id: I7a26478d3e97c89ff2dd978ba53ba83aa3e1912a
Closes-Bug: 1557117

toscaparser/tests/data/test_tosca_top_level_error1.yaml

@@ -1,31 +1,2 @@
 description: >
   TOSCA simple profile missing version section.
-
-topology_template:
-  inputs:
-    cpus:
-      type: integer
-      description: Number of CPUs for the server.
-      constraints:
-        - valid_values: [ 1, 2, 4, 8 ]
-
-  node_templates:
-    server:
-      type: tosca.nodes.Compute
-      capabilities:
-        host:
-          properties:
-            disk_size: 10 GB
-            num_cpus: { get_input: cpus }
-            mem_size: 4096 MB
-        os:
-          properties:
-            architecture: x86_64
-            type: Linux
-            distribution: Fedora
-            version: 18.0
-
-  outputs:
-    server_address:
-      description: IP address of server instance.
-      value: { get_property: [server, private_address] }

toscaparser/tests/data/test_tosca_top_level_error2.yaml

@@ -4,30 +4,8 @@ description: >
   TOSCA simple profile with invalid top-level key: 'node_template'.
 
 topology_template:
-  inputs:
-    cpus:
-      type: integer
-      description: Number of CPUs for the server.
-      constraints:
-        - valid_values: [ 1, 2, 4, 8 ]
 
   node_template:
     server:
       type: tosca.nodes.Compute
-      capabilities:
-        host:
-          properties:
-            disk_size: 10 GB
-            num_cpus: { get_input: cpus }
-            mem_size: 4096 MB
-        os:
-          properties:
-            architecture: x86_64
-            type: Linux
-            distribution: Fedora
-            version: 18.0
 
-  outputs:
-    server_address:
-      description: IP address of server instance.
-      value: { get_property: [server, private_address] }