Api Management - Save Policy adding BOM when saving in UTF-8 format

[solankisamir]

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Description

In the recent change we started saving Policy specifying the Encoding, which caused the BOM characters to be added.
16bd80d#diff-32398c8bfd5a39b14a4be7f05180db5a

UTF-8 with BOM is not recommended and it is a regression.

[solankisamir]

Fixed in release https://github.com/Azure/azure-powershell/releases/tag/v6.6.0-July2018