Migrate to new database server

[santoshamohan]

Migrate to new NCI db server:

• Add new server config information in datacube.conf file as datacube-pilot
• Update datacube-ensure-user.py to create new user db account, if the user is not migrated to the new database server
• Add pytest

[codecov[bot]]

Codecov Report

Merging #123 into master will increase coverage by 2.97%. The diff coverage is 80.76%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   60.37%   63.35%   +2.97%     
==========================================
  Files          16       16              
  Lines        1123     1157      +34     
==========================================
+ Hits          678      733      +55     
+ Misses        445      424      -21

Impacted Files	Coverage Δ
raijin_scripts/deploy/dea/datacube-ensure-user.py	88.94% <80.76%> (+13.53%)	:arrow_up:

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[omad]

We're still going to do this, the code has been merged elsewhere.