##### SUMMARY
The azure_rm_cdnprofile module was missing a valid sku 'standard_microsoft'. Added it to the list of valid choices.
##### ISSUE TYPE
- Bugfix Pull Request
##### COMPONENT NAME
azure_rm_cdnprofile
##### ANSIBLE VERSION
```
ansible 2.8.0.dev0
config file = /etc/ansible/ansible.cfg
configured module search path = [u'/home/user/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
ansible python module location = /usr/local/lib/python2.7/dist-packages/ansible
executable location = /usr/local/bin/ansible
python version = 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0]
```
##### ADDITIONAL INFORMATION
It was not possible to deploy using the 'standard_microsoft' sku previously. This addition allows this.
John R Barker
Zim Kalinowski
richardlock
Yunge Zhu