Add ability for Bitbucket clients to specify repos by projectKey
Created by: susantoscott
Previously Bitbucket clients could only specify repos by projectName. Now, if projectKeys are specified in s.config.ProjectKeys, then those repos would be returned as well.
Test plan
go test -run TestBitbucketServerSource_ListRepos \\ to list all repos
go test -run TestBitbucketServerSource_ListByReposOnly \\ to list repos in the config
go test -run TestBitbucketServerSource_ListByRepositoryQuery \\ to list repos by projectName
go test -run TestBitbucketServerSource_ListByProjectKey \\ to list repos by projectKey