[shard_seed] fix default_sources for linux, darwin and windows

[michel-slm]

Description

collect_os now returns a string (see mixin/os.rb), but the shard plugin still assumed it returns a symbol, so no matter the OS, unless overridden in client.rb this plugin will only use the machine name as the shard source.

Signed-off-by: Michel Salim michel@fb.com

Related Issue

#1378

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commits have been signed-off for the Developer Certificate of Origin.

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This change is 

[lock]

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