Role specific derive parameters workflow parameter

Added 'hw_data_required' parameter with default value 'true'.
This parameter is used to identify whether role specific
derive parameters workflows needs to be invoked or not.
invokes role specific derive parameters if hw_data_required is
true, otherwise only common derive parameters will be invoked.

Change-Id: I9807dbd1cb71deb6a483f24d36db344b8a09c63e

plan-samples/plan-environment-derived-params.yaml

@@ -8,6 +8,12 @@ environments:
   - path: overcloud-resource-registry-puppet.yaml
 workflow_parameters:
   tripleo.derive_params.v1.derive_parameters:
+    ########### Role-Specific derive parameters ##############
+    # Introspection hardware data is mandatory for role-specific
+    # derive parameters. Role specific derive parameters workflows
+    # will be invoked if this parameter is true, otherwise only
+    # derive parameters common workflows will be invoked.
+    hw_data_required: true
     ######### DPDK Parameters #########
     # Specifices the minimum number of CPU physical cores to be allocated for DPDK
     # PMD threads. The actual allocation will be based on network config, if