BAH-643 Upgrade dependencies and where necessary the code to java 8

[hafizh]

Ticket: https://bahmni.atlassian.net/browse/BAH-643

• Since it's quite old project, it's not easy to install versions of dependencies required.
• I've setup the db as described in another ticket: https://bahmni.atlassian.net/browse/BAH-1252
• According to that ticket there is one test failing, which is also my experience, but it looks slightly different (could be result of java 7 -> 8), will analyse further.

Running org.bahmni.feed.openelis.feed.event.EncounterFeedWorkerTest
    [junit] 2022-07-29 09:29:34,185 main ERROR Could not reconfigure JMX java.lang.LinkageError: loader constraint violation: loader (instance of org/powermock/core/classloader/MockClassLoader) previously initiated loading for a different type with name "javax/management/MBeanServer"

UPDATE
Above test and another one that was failing fixed.

1. Run Postgres:
   docker run --name postgresdb -e POSTGRES_PASSWORD=${PGPASSWORD} -p 5432:5432 -d postgres:9.6
2. Clean, compile, test and build war:
   ant clean compile resetDB test-only report dist

Let me know if there are other points to consider.

[CLAassistant]

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