zlux can't load PEM section of zowe.yaml when multiple entries exist

[1000TurquoisePogs]

Regardless of how multiple entries are specified, such as:

pem:
  certificateAuthorities:
  - entry1
  - entry2

pem:
  certificateAuthorities:
  - entry1,entry2

pem: 
  certificateAuthorities: entry1,entry2

Then it fails. zlux will accidetanlly wrap the CAs in 2 arrays instead of 1, like so:

OK
certificateAuthorities: [
‘/a/user/zowe/keystore-extended/localhost/extca1.cer'
]

Not OK
certificateAuthorities: [
[
'/a/user/zowe/keystore-extended/localhost/extca1.cer',
'/a/user/zowe/keystore-extended/localhost/extca2.cer'
]
]