Fix bastion host variable on AWS

[ydp]

What this PR does / why we need it

The old code to receive bastion host variable by if condition is setting the value as true in all conditions, fix it by using the variable directly.

Which issue(s) this PR fixes

Part of #3616

Describe testing done for PR

Release note

Support disable bastion host in classy cluster on AWS

Additional information

Special notes for your reviewer

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3675/20221015045358/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3675/20221015062952/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[codecov]

Codecov Report

Merging #3675 (30a104b) into main (f3c0f92) will decrease coverage by 0.96%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3675      +/-   ##
==========================================
- Coverage   46.30%   45.34%   -0.97%     
==========================================
  Files         400      425      +25     
  Lines       39624    41188    +1564     
==========================================
+ Hits        18347    18675     +328     
- Misses      19594    20804    +1210     
- Partials     1683     1709      +26     

Impacted Files	Coverage Δ
...oller-manager/controllers/v3_cascade_controller.go	61.90% <0.00%> (-3.81%)	⬇️
addons/controllers/machine_controller.go	65.65% <0.00%> (-3.04%)	⬇️
...tanzu-auth-controller-manager/controllers/utils.go	72.58% <0.00%> (-1.62%)	⬇️
addons/controllers/clusterbootstrap_controller.go	63.85% <0.00%> (-1.61%)	⬇️
cmd/cli/plugin/cluster/osimage_oracle.go	3.22% <0.00%> (ø)
cmd/cli/plugin/cluster/credentials_update.go	9.23% <0.00%> (ø)
cmd/cli/plugin/cluster/delete_node_pool.go	16.66% <0.00%> (ø)
cmd/cli/plugin/cluster/get.go	6.27% <0.00%> (ø)
cmd/cli/plugin/cluster/osimage.go	100.00% <0.00%> (ø)
cmd/cli/plugin/cluster/machinehealthcheck.go	100.00% <0.00%> (ø)
... and 19 more

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