Update gsb format and enhance gsb check function.

Author: migochen

gemini_solution_builder/templates/base/LICENSE

@@ -0,0 +1,32 @@
+create_site:
+  - parameter: private_network
+    forms: ChoiceField
+    label: Network
+    # TODO We need to define general syntex on YAML for network
+    widget:
+      forms: Select
+      attrs:
+        - class: form-control
+        - required: required
+  - parameter: image
+    forms: ChoiceField
+    label: VM Image
+    choices:
+        - Windows7-2017.2.0: Windows7-2017.2.0
+        - Ubuntu14.04-2017.2.0: Ubuntu14.04-2017.2.0
+    widget:
+      forms: Select
+      attrs:
+        - class: form-control
+  - parameter: flavor
+    forms: ChoiceField
+    label: Server Size
+    choices:
+        - 1core2GBmemory20GBdisk: 1core2GBmemory20GBdisk
+        - 2cores4GBmemory40GBdisk: 2cores4GBmemory40GBdisk
+        - 4cores8GBmemory80GBdisk: 4cores8GBmemory80GBdisk
+        - 8cores16GBmemory160GBdisk: 8cores16GBmemory160GBdisk
+    widget:
+      forms: Select
+      attrs:
+        - class: form-control

gemini_solution_builder/templates/base/configure/salt/logstash/files/linux/logstash-forwarder.conf

@@ -68,6 +68,13 @@ def get_version_mapping_from_solution(solution_path):
     if not utils.exists(meta_path):
         errors.WrongSolutionDirectoryError(
             'Wrong path to the solution, cannot find "%s" file', meta_path)
+        raise Exception('cannot find %s file' % meta_path)
+
+    site_path = join_path(solution_path, 'site.yaml')
+    if not utils.exists(site_path):
+        errors.WrongSolutionDirectoryError(
+            'Wrong path to the solution, cannot find "%s" file', site_path)
+        raise Exception('cannot find %s file' % site_path)
 
     meta = utils.parse_yaml(meta_path)
     package_version = meta.get('version')