The jira module uses ansible.module_utils.urls.fetch_url which will
attempt to get that value of the validate_certs parameter from the
module; if present it will honor it's value, otherwise it defaults
to True.
This patch adds that parameter to jira so that it can be specified
by the user and honored by ansible.module_utils.urls.fetch_url
Signed-off-by: Adam Miller <admiller@redhat.com>