Adding GCS and ABS to allowed inputs in filebeat spec (#2149)

Author: P1llus

specs/filebeat.spec.yml

@@ -45,6 +45,12 @@ inputs:
     outputs: *outputs
     shippers: *shippers
     command: *command
+  - name: azure-blob-storage
+    description: "Azure Blob Storage"
+    platforms: *platforms
+    outputs: *outputs
+    shippers: *shippers
+    command: *command
   - name: azure-eventhub
     description: "Azure Eventhub"
     platforms: *platforms
@@ -89,6 +95,12 @@ inputs:
     outputs: *outputs
     shippers: *shippers
     command: *command
+  - name: gcs
+    description: "Google Cloud Storage"
+    platforms: *platforms
+    outputs: *outputs
+    shippers: *shippers
+    command: *command
   - name: http_endpoint
     description: "HTTP Endpoint"
     platforms: *platforms