Fix idempotency of intermediate certificates

Prior to this change running the vault_pki role multiple times when generating
an intermediate certificate could result in the following error:

TASK [vault_pki : Set Intermediate as signed] **********************************
fatal: [localhost]: FAILED! =>
  msg: |-
    The task includes an option with an undefined variable. The error was:
    'dict object' has no attribute 'data'

    The error appears to be in 'roles/vault_pki/tasks/intermediate.yml': line
    45, column 7, but may be elsewhere in the file depending on the exact
    syntax problem.

    The offending line appears to be:

        - name: "Set Intermediate as signed"
          ^ here

This change adds the same condition used in other tasks.

Author: markgoddard

roles/vault_pki/tasks/intermediate.yml

@@ -53,6 +53,8 @@
           {{ intermediate_ca_csr_signed.data.issuing_ca }}
       when:
         - not vault_pki_intermediate_export | bool
+        - intermediate_ca_csr.changed
+        - intermediate_ca_csr.data is defined
 
     - name: "Set Exported Intermediate as signed"
       hashivault_pki_ca_set:
@@ -78,6 +80,8 @@
       delegate_to: "{{ vault_pki_write_certificates_host }}"
       when:
         - vault_pki_write_int_ca_to_file | bool
+        - intermediate_ca_csr.changed
+        - intermediate_ca_csr.data is defined
 
     - name: "Write out Intermediate Certs and keys to file"
       copy: