Configure static website on storage account

[l3ender]

SUMMARY

This PR adds the ability to configure the static website feature of a blob storage account.

Fixes #459.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

plugins/modules/azure_rm_storageaccount.py
plugins/modules/azure_rm_storageaccount_info.py

ADDITIONAL INFORMATION

Sanity and integration tests were run as follows:

ansible-test sanity azure_rm_storageaccount --color --junit -v
ansible-test sanity azure_rm_storageaccount_info --color --junit -v
ansible-test integration azure_rm_storageaccount --allow-destructive -v

[l3ender]

@Fred-sun Hello! This is a PR to allow new configuration functionality for a storage account's static website. Please review...thank you!

[xuzhang3]

@l3ender LGTM