Running local test creates excessive image rendering.

[techcobweb]

Signed-off-by: Mike Cobbett 77053+techcobweb@users.noreply.github.com

• bootstrap.properties comments has a small bug inside. Fixed.
• build-locally.sh script runs 2 simple tests to up the unit test for extra coverage, instead of 1.
• found lots of code where err was being checked but we already know it's nill or non-nil.
• found some code which would trap. eg: err.Error() when we already know err is nil.
• found some unused parameters. 2 I commented, as i'm unsure why the code is like it is... think there is something wrong in those two areas ?
• image rendering only happens once after a local run, against the entire home folder.
• messages suppressed to make logs more readable.
• removed unused parameters in some places.
• Local runs : images are rendered only on the runs folders which were created by the runs.
• Download --force allows images to be overwritten.

This PR fixes CLI: Galsactl logs too much when rendering images during local test runs
#1803

[galasa-team]

Build successful