Description of problem:
awscli package seems to require python3-PyYAML, but it isn't a runtime dependency.

Version-Release number of selected component (if applicable):
awscli-1.11.24-1.fc25.noarch

How reproducible:
Always

Steps to Reproduce:
1. 'dnf install awscli'
2. 'aws configure' fails
$ aws configure
Traceback (most recent call last):
  File "/usr/bin/aws", line 27, in <module>
    sys.exit(main())
  File "/usr/bin/aws", line 23, in main
    return awscli.clidriver.main()
  File "/usr/lib/python3.5/site-packages/awscli/clidriver.py", line 53, in main
    driver = create_clidriver()
  File "/usr/lib/python3.5/site-packages/awscli/clidriver.py", line 62, in create_clidriver
    event_hooks=emitter)
  File "/usr/lib/python3.5/site-packages/awscli/plugin.py", line 44, in load_plugins
    modules = _import_plugins(plugin_mapping)
  File "/usr/lib/python3.5/site-packages/awscli/plugin.py", line 61, in _import_plugins
    module = __import__(path, fromlist=[module])
  File "/usr/lib/python3.5/site-packages/awscli/handlers.py", line 27, in <module>
    from awscli.customizations.cloudformation import initialize as cloudformation_init
  File "/usr/lib/python3.5/site-packages/awscli/customizations/cloudformation/__init__.py", line 13, in <module>
    from awscli.customizations.cloudformation.package import PackageCommand
  File "/usr/lib/python3.5/site-packages/awscli/customizations/cloudformation/package.py", line 21, in <module>
    from awscli.customizations.cloudformation.artifact_exporter import Template
  File "/usr/lib/python3.5/site-packages/awscli/customizations/cloudformation/artifact_exporter.py", line 25, in <module>
    from awscli.customizations.cloudformation.yamlhelper import yaml_dump, \
  File "/usr/lib/python3.5/site-packages/awscli/customizations/cloudformation/yamlhelper.py", line 14, in <module>
    import yaml
ImportError: No module named 'yaml'
3. 'dnf install python3-PyYAML'
4. 'aws configure' succeeds

Actual results:
aws configure crashes because of missing dependency

Expected results:
aws configure works without complaining out of the box