Adding JIRA User Directory With URL Context Path Containing "services" Fails

Summary

Adding a JIRA user directory that has a context path containing "services" fails. When building the Crowd URL, everything including and after "services" is removed.

For example:
JIRA Base URL: http://localhost:8080/services/jira
URL Stash tries to use: http://localhost:8080/rest/usermanagement/1/search?entity-type=user&start-index=0&max-results=1&expand=user

JIRA Base URL: http://localhost:8080/atlassian/services/jira
URL Stash tries to use: http://localhost:8080/atlassian/rest/usermanagement/1/search?entity-type=user&start-index=0&max-results=1&expand=user

Steps to Reproduce:

1. Change your JIRA base URL to contain "services" in the context path. http://localhost:8080/services/jira.
2. In Stash, go to Administration > User Directories.
3. Select Add Directory > Atlassian JIRA.
4. For the Server URL, specify http://localhost:8080/services/jira.
5. Select Test

Workaround

Change your JIRA Base URL to not contain services.