TRUNK-5007: Enable the ExistingOrNewVisitAssignmentHandler to handle wild cards for encounter type to visit type.

[IamMujuziMoses]

Issue I worked on

see https://issues.openmrs.org/browse/TRUNK-5007

Checklist: I completed these to help reviewers :)

• [ ] My IDE is configured to follow the code style of this project.

  No? Unsure? -> configure your IDE, format the code and add the changes with git add . && git commit --amend

• [ ] I have added tests to cover my changes. (If you refactored existing code that was well tested you do not have to add tests)

  No? -> write tests and add them to this commit git add . && git commit --amend

• [ ] I ran mvn clean package right before creating this pull request and added all formatting changes to my commit.

  No? -> execute above command

• [ ] All new and existing tests passed.

  No? -> figure out why and add the fix to your commit. It is your responsibility to make sure your code works.

• [ ] My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master

[IamMujuziMoses]

@ssmusoke @dkayiwa @ibacher could you please review this PR, your feedback will be appreciated.

[dkayiwa]

When ready for review, remember to always hit the Request Code Review button as advised at https://wiki.openmrs.org/display/docs/Pull+Request+Tips