Remove no longer used BitbucketImport::Client spec

spec/lib/gitlab/bitbucket_import/client_spec.rb

-require 'spec_helper'
-
-describe Gitlab::BitbucketImport::Client, lib: true do
-  include ImportSpecHelper
-
-  let(:token) { '123456' }
-  let(:secret) { 'secret' }
-  let(:client) { Gitlab::BitbucketImport::Client.new(token, secret) }
-
-  before do
-    stub_omniauth_provider('bitbucket')
-  end
-
-  it 'all OAuth client options are symbols' do
-    client.consumer.options.keys.each do |key|
-      expect(key).to be_kind_of(Symbol)
-    end
-  end
-
-  context 'issues' do
-    let(:per_page) { 50 }
-    let(:count) { 95 }
-    let(:sample_issues) do
-      issues = []
-
-      count.times do |i|
-        issues << { local_id: i }
-      end
-
-      issues
-    end
-    let(:first_sample_data) { { count: count, issues: sample_issues[0..per_page - 1] } }
-    let(:second_sample_data) { { count: count, issues: sample_issues[per_page..count] } }
-    let(:project_id) { 'namespace/repo' }
-
-    it 'retrieves issues over a number of pages' do
-      stub_request(:get,
-                   "https://bitbucket.org/api/1.0/repositories/#{project_id}/issues?limit=50&sort=utc_created_on&start=0").
-        to_return(status: 200,
-                  body: first_sample_data.to_json,
-                  headers: {})
-
-      stub_request(:get,
-                   "https://bitbucket.org/api/1.0/repositories/#{project_id}/issues?limit=50&sort=utc_created_on&start=50").
-        to_return(status: 200,
-                  body: second_sample_data.to_json,
-                  headers: {})
-
-      issues = client.issues(project_id)
-      expect(issues.count).to eq(95)
-    end
-  end
-
-  context 'project import' do
-    it 'calls .from_project with no errors' do
-      project = create(:empty_project)
-      project.import_url = "ssh://git@bitbucket.org/test/test.git"
-      project.create_or_update_import_data(credentials:
-                                             { user: "git",
-                                               password: nil,
-                                               bb_session: { bitbucket_access_token: "test",
-                                                             bitbucket_access_token_secret: "test" } })
-
-      expect { described_class.from_project(project) }.not_to raise_error
-    end
-  end
-end