[FIXED JENKINS-20226] Supports @DataBoundConstructor.
[JENKINS-20226] Restored hudsonUrl, which is referred by JenkinsLocationConfiguration. Added a test to verify JenkinsLocationConfiguration can refer it.
Merge pull request #8 from ikedam/feature/JENKINS-20226_DataBoundConstructor

[FIXED JENKINS-20226] Supports @DataBoundConstructor.