[glue script][terraform] boolean values in terraform::variables of the config.yaml for the glue script are not properly translated in terraform.tfvars

[mpagot]

How to reproduce:
Run qesap.py -c config.yaml -b somewhere configure with terraform::variables section of config.yaml to also contain variable like:

terraform:
  variables:
    hana_ha_enabled: true

result in terraform.tfvars to be generated with

hana_ha_enabled = "True"

That is not a valid value for Terraform

[mpagot]

Workaround is to use, in the config.yaml, a syntax like

terraform:
  variables:
    hana_ha_enabled: "true"

[mpagot]

still valid