Permit bug URLs to have the prefix "https://launchpad.net/bugs/"

[waveform80]

For example https://launchpad.net/bugs/1951586 is a valid bug URL, and the default generated by the format LP: #NNNNNN on the console (and some other tools). However, this URL is currently rejected by test observer when reporting bugs associated with a test.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/TO-353.

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[waveform80]

Hmm, possibly a duplicate of #517, but this is "yet another" URL format to be added to the one specified in that ticket.