Constant names should comply with a naming convention

Following https://wiki.openmrs.org/display/docs/Java+Conventions

Any constants should be written in uppercase letters.

SonarQube links:

• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=738e1dde-bb6e-413b-84bd-f18d2403734b&open=738e1dde-bb6e-413b-84bd-f18d2403734b
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=e4604653-2e26-4221-a7d7-ed82cda64cf6&open=e4604653-2e26-4221-a7d7-ed82cda64cf6
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=f6bf9a32-115f-4dff-9ffd-9b10c18bfa5d&open=f6bf9a32-115f-4dff-9ffd-9b10c18bfa5d
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=07158c82-16cb-4df6-b947-7b9038ea17f5&open=07158c82-16cb-4df6-b947-7b9038ea17f5
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=55383508-abb5-450c-b6f9-f2ec2ff9c8cb&open=55383508-abb5-450c-b6f9-f2ec2ff9c8cb
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=4df71f42-0afa-4c00-847e-d284f6884b64&open=4df71f42-0afa-4c00-847e-d284f6884b64
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=AXParDdt5zdzQEOFIPDj&open=AXParDdt5zdzQEOFIPDj
• https://sonar.openmrs.org/project/issues?id=org.openmrs%3Aopenmrs&issues=AXParDdt5zdzQEOFIPDk&open=AXParDdt5zdzQEOFIPDk

Solution:
Rename all constants according to a naming convention.