Add storage_profile parameter to azure_rm_mysqlserver

[el-memer]

SUMMARY

There are some missing parameters in the Mysql Module, related to storage_profile.
The missing parameters are:

• backupRetentionDays
• geoRedundantBackup
• storageAutogrow

ISSUE TYPE

• Module Improvement

COMPONENT NAME

azure_rm_mysqlserver

ADDITIONAL INFORMATION

These parameters can't be changed after instance creation and force to use template deployment.

I think the parameters should be set this way:

        storage_profile:
          storage_mb: 512
          backupRetentionDays: 7
          geoRedundantBackup: enabled
          storageAutogrow: enabled

[Fred-sun]

fixes by #563