awscli-bundle 1.6.256 does not install with Python 2.6 (colorama dependency not met)

On-going issue with colorama dependency.



previous closed issue: https://github.com/aws/aws-cli/issues/4563



```

sudo awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws

...

Running cmd: /usr/bin/python virtualenv.py --no-download --python /usr/bin/python /usr/local/aws

Running cmd: /usr/local/aws/bin/pip install --no-cache-dir --no-index --find-links file:///root/aws-install/awscli-bundle/packages/setup setuptools_scm-1.15.7.tar.gz

Running cmd: /usr/local/aws/bin/pip install --no-cache-dir --no-index --find-links file:///root/aws-install/awscli-bundle/packages awscli-1.16.256.tar.gz

Running cmd: /usr/bin/python virtualenv.py --no-download --python /usr/bin/python /usr/local/aws

Running cmd: /usr/local/aws/bin/pip install --no-cache-dir --no-index --find-links file:///root/aws-install/awscli-bundle/packages/setup setuptools_scm-1.15.7.tar.gz

Running cmd: /usr/local/aws/bin/pip install --no-cache-dir --no-index --find-links file:///root/aws-install/awscli-bundle/packages awscli-1.16.256.tar.gz

STDERR: Traceback (most recent call last):

  File "./awscli-bundle/install", line 162, in <module>

    main()

  File "./awscli-bundle/install", line 151, in main

    pip_install_packages(opts.install_dir)

  File "./awscli-bundle/install", line 119, in pip_install_packages

    pip_script, PACKAGES_DIR, cli_tarball))

  File "./awscli-bundle/install", line 49, in run

    p.returncode, cmd, stdout + stderr))

__main__.BadRCError: Bad rc (1) for cmd '/usr/local/aws/bin/pip install --no-cache-dir --no-index --find-links file:///root/aws-install/awscli-bundle/packages awscli-1.16.256.tar.gz': Processing ./awscli-1.16.256.tar.gz

Collecting botocore==1.12.246 (from awscli==1.16.256)

Collecting docutils<0.16,>=0.10 (from awscli==1.16.256)

Collecting rsa<=3.5.0,>=3.1.2 (from awscli==1.16.256)

Collecting s3transfer<0.3.0,>=0.2.0 (from awscli==1.16.256)

Requirement already satisfied: argparse>=1.1 in /usr/local/aws/lib/python2.6/site-packages (from awscli==1.16.256)

Collecting PyYAML<=3.13,>=3.10 (from awscli==1.16.256)

Collecting colorama<0.3.9,>=0.2.5 (from awscli==1.16.256)

DEPRECATION: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. A future version of pip will drop support for Python 2.6

  Could not find a version that satisfies the requirement colorama<0.3.9,>=0.2.5 (from awscli==1.16.256) (from versions: 0.3.9, 0.4.1)

No matching distribution found for colorama<0.3.9,>=0.2.5 (from awscli==1.16.256)

```

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