:bug: Address @tlynchpin's review
:bug: Address @tlynchpin's review

 - Typo/logic bug: ProxyServer should be ProxyServerPort

 - Support multi-protocol, multi-proxy configs (;-separated)

 - Ignores pathological config (enabled proxy, blank proxy host)

oktadeveloper/okta-aws-cli-assume-role,oktadeveloper/okta-aws-cli-assume-role,oktadeveloper/okta-aws-cli-assume-role