RESTWS-741: Remove OMOD-1.8

[josephbate]

Description of what I changed

1. Transfered classes and dependant classes from 1.8 to 1.9
2. merged similliar classes that apeared in both omods
3. Edited RestTestConstants1_9.java to include all the constants of RestTestConstants1_8.java
4. edited all classes in the omods above 1.8 to import RestTestConstants1_9.java
5. transfered resourse datasets from 1.8 to 1.9

Cc. @dkayiwa @ibacher @mks-d

Issue I worked on

see https://openmrs.atlassian.net/browse/RESTWS-741

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

[josephbate]

@ibacher is there any more requirements on this ticket