##### SUMMARY
The file contents that end up as the output of ecs_certificates "full_chain_path" are not a valid format for import into, for example, a PKCS12 store.

This is the result of the return value of the ECS API being an array, and not properly turning that array into concatenated certificates for the resulting PEM file.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
ecs_certificate

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
Applies to ansible 2.9.0.dev0

##### CONFIGURATION
N/A affects all configurations

##### OS / ENVIRONMENT
N/A affects all OS/environment


##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Populate full_chain_path and inspect output

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
A properly formatted PEM certificate chain

##### ACTUAL RESULTS
A certificate chain in format ['CERT','CERT']

tracking_id: 2378915
    request_type: reissue
    entrust_api_user: apiusername
    entrust_api_key: a^lv*32!cd9LnT
    entrust_api_client_cert_path: /etc/ssl/entrust/ecs-client.crt
    entrust_api_client_cert_key_path: /etc/ssl/entrust/ecs-client.key
- name: Request a new certificate with an alternative client. Note that the
        issued certificate will have it's Subject Distinguished Name use the
        organization details associated with that client, rather than what is
        in the CSR.
  ecs_certificate:
    path: /etc/ssl/crt/ansible.com.crt
    csr: /etc/ssl/csr/ansible.com.csr
    client_id: 2
    requester_name: Jo Doe
    requester_email: jdoe@ansible.com
    requester_phone: 555-555-5555
    entrust_api_user: apiusername
    entrust_api_key: a^lv*32!cd9LnT
    entrust_api_client_cert_path: /etc/ssl/entrust/ecs-client.crt
    entrust_api_client_cert_key_path: /etc/ssl/entrust/ecs-client.key
- name: Request a new certificate with a number of CSR parameters overridden
        and tracking information
  ecs_certificate:
    path: /etc/ssl/crt/ansible.com.crt
    full_chain_path: /etc/ssl/crt/ansible.com.chain.crt
    csr: /etc/ssl/csr/ansible.com.csr
    subject_alt_name:
      - ansible.testcertificates.com
      - www.testcertificates.com