Description of problem:
upload-puppet-modules command if executed multiple times, then incorrectly creates the swift temp url. In the first run of upload puppet modules, it's creating the swift temp url correctly. But on subsequent runs, it is creating the url incorrectly. New temp url does not contain "temp_url_sig" field.

Version-Release number of selected component (if applicable):
Red Hat Openstack 16.0


Steps to Reproduce:

1. Run upload-puppet-modules command 
$ cp -r /usr/share/openstack-puppet/modules/tripleo ~/puppet-modules
$ upload-puppet-modules --directory puppet-modules

2. Check swift temp url created
It will look like following.

[stack@undercloud ~]$ cat /home/stack/.tripleo/environments/puppet-modules-url.yaml
# Heat environment to deploy artifacts via Swift Temp URL(s)
parameter_defaults:
    DeployArtifactURLs:
    - 'http://172.172.3.83:8080/v1/AUTH_2ba8739bd95040d38337e5ecbb68e620/overcloud-artifacts/puppet-modules.tar.gz?temp_url_sig=8790e72a801e8d8ad016b850c7fa0044f605f94f&temp_url_expires=1614329134

3. Now run upload-puppet-modules command again. It will throw a warning and will complete with incorrect swift temp url.

(undercloud) [stack@director ~]$ upload-puppet-modules --directory puppet-modules

Creating tarball...
Tarball created.
/usr/bin/upload-swift-artifacts: line 132: [: {'Temp-Url-Key':: binary operator expected
Creating heat environment file: /home/stack/.tripleo/environments/puppet-modules-url.yaml
Uploading file to swift: /tmp/puppet-modules-Nm6O2gc/puppet-modules.tar.gz
+-----------------------+---------------------+----------------------------------+
| object                | container           | etag                             |
+-----------------------+---------------------+----------------------------------+
| puppet-modules.tar.gz | overcloud-artifacts | 66f9c13bb4ee7f8fb20421dbb2dd3231 |
+-----------------------+---------------------+----------------------------------+
Upload complete.
sha1: Option -hmac needs a value
sha1: Use -help for summary.


(undercloud) [stack@director ~]$ cat /home/stack/.tripleo/environments/puppet-modules-url.yaml
# Heat environment to deploy artifacts via Swift Temp URL(s)
parameter_defaults:
    DeployArtifactURLs:
    - 'http://192.168.24.3:8080/v1/AUTH_0440bfe31e4d4d0b8b1f323cc52a8466/overcloud-artifacts/puppet-modules.tar.gz?temp_url_sig=&temp_url_expires=1614422474'

Actual results:
Subsequent upload of modules return invalid temp-url.

Expected results:
It should return valid temp-url as it does in first run of upload-puppet-modules command.

Additional info:
In RHOSP13, running upload-puppet-modules multiple times always returned a valid url.