Allow control of acceptance tests by more env vars

[phil-davis]

Description

Instead of hard-coded defaults, if a parameter is already specified as an environment variable, then use that value.

Related Issue

owncloud/QA#582

Motivation and Context

In order to control the behavior of acceptance tests, as well as the current command parameters to run.sh we should be able to set environment variables externally. This will help when implementing things like make test-acceptance-api in make files. Developers and scripts can then easily specify needed environment variables on the end of the make command.

How Has This Been Tested?

Local runs of acceptance tests specifying various combinations of external environment variables.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[codecov]

Codecov Report

Merging #32445 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #32445   +/-   ##
=========================================
  Coverage     64.06%   64.06%           
  Complexity    18634    18634           
=========================================
  Files          1176     1176           
  Lines         70142    70142           
  Branches       1267     1267           
=========================================
  Hits          44934    44934           
  Misses        24838    24838           
  Partials        370      370

Flag	Coverage Δ	Complexity Δ
#javascript	52.84% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.33% <ø> (ø)	18634 <ø> (ø)	⬇️

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[phil-davis]

Backport stable10 #32449