##### 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']

sample: /etc/ssl/crt/www.ansible.com.crt
backup_file:
    description: Name of backup file created for the certificate.
    returned: changed and if I(backup) is C(true)
    type: str
    sample: /path/to/www.ansible.com.crt.2019-03-09@11:22~
backup_full_chain_file:
    description: Name of the backup file created for the certificate chain.
    returned: changed and if I(backup) is C(true) and I(full_chain_path) is set.
    type: str
    sample: /path/to/ca.chain.crt.2019-03-09@11:22~
tracking_id:
    description: The tracking ID to reference and track the certificate in ECS.
    returned: success
    type: int
    sample: 380079
serial_number:
    description: The serial number of the issued certificate.
    returned: success
    type: int
    sample: 1235262234164342
cert_days:
    description: The number of days the certificate remains valid.
    returned: success
    type: int
    sample: 253
cert_status:
    description:
        - The certificate status in ECS.
        - 'Current possible values (which may be expanded in the future) are: C(ACTIVE), C(APPROVED), C(DEACTIVATED), C(DECLINED), C(EXPIRED), C(NA),