Bundle series selection supports charm default series

[wallyworld]

If the charm in a bundle is a local path, we need to allow for the fact that the charm may define a default series in metadata. We check for that first before trying to get the series from the charm url.

[jujugui]

Test FAILed.
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Test FAILed.

[jujugui]

Test FAILed.
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Test FAILed.

[frankban]

👍 when CI passes. Thank you!

[jujugui]

Test FAILed.
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[jujugui]

Test PASSed.
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Test PASSed.

[wallyworld]

[jujugui]

Status: merge request accepted. Url: http://ci.jujugui.org:8080/job/bundlechanges-merge

[jujugui]

Build failed: Attempt to land pull request failed
build url: http://ci.jujugui.org:8080/job/bundlechanges-merge/20

[wallyworld]

[jujugui]

Status: merge request accepted. Url: http://ci.jujugui.org:8080/job/bundlechanges-merge