PUV - Script should pull in env var with apic-token if available

[monrog2]

Today; user must explicitly enter credentials

for PUV, there will be no explicit user input, but there will be an env having a valid token for API use. Have some logic/option to be able to pull in an ENV var and pass it into the icurl function for API calls.

can test with this for CLI run vs PUV run:
SESSION_FILE="/.aci/.sessions/.token"

[monrog2]

confirmed that script container will make icurl available usin teh token sessions file, similar to a standard APIC login. Hence, we don't have any work to be done here for checking ENV/etc