Refactored remaining tests without unique DB names

[ricellis]

Checklist

• [x] Tick to sign-off your agreement to the Developer Certificate of Origin (DCO) 1.1
• [x] Added tests for code changes or test/build only changes
• [x] Updated the change log file (CHANGES.md|CHANGELOG.md) or test/build only changes
• [x] Completed the PR template below:

Description

Fixed remaining tests that didn't use a unique db name.

1. Steps to reproduce and the simplest code sample possible to demonstrate the issue

Run tests in parallel.

2. What you expected to happen

Tests to pass.

3. What actually happened

Test failures e.g.

QA / Node8x / test.Cloudant Search."before all" hook
Error Message
The database could not be created, the file already exists.

Approach

334 re-enabled parallel testing, but no failures happened on the branch before it merged. Once it was merged the master build failed.

Some tests used non-unique DB names, replace these remaining test instances with unique db names.

Schema & API Changes

• "No change"

Security and Privacy

• "No change"

Testing

• Modified existing tests because to correct static db names.

Monitoring and Logging

• "No change"