implement friendly field aliases (like "date" instead of "public_date" and "severity" instead of "threat_severity") for --fields option

[ryran]

Yep!

[ryran]

DONE!

$ rhsecapi --help
...
CVE DISPLAY OPTIONS:
  -f, --fields FIELDS   Customize field display via comma-separated case-
                        insensitive list (default: threat_severity,
                        public_date, bugzilla, affected_release,
                        package_state); see --all-fields option for full list
                        of official API-provided fields; shorter field
                        aliases: threat_severity → severity, public_date →
                        date, affected_release → fixed_releases or fixed or
                        releases, package_state → fix_states or states;
                        optionally prepend FIELDS with plus (+) sign to add
                        fields to the default (e.g., '-f +iava,cvss3') or a
                        caret (^) to remove fields from the default (e.g., '-f
                        ^bugzilla,severity')
...

$ rhsecapi CVE-2016-6302 -f janky
rhsecapi: Field 'janky' is not a supported field; valid fields:
threat_severity, public_date, iava, cwe, cvss, cvss3, bugzilla, acknowledgement, details, statement, mitigation, upstream_fix, references, affected_release, package_state, severity, releases, fixed_releases, states, fix_states, date, fixed

$ rhsecapi CVE-2016-6302 -vf releases,severity
DEBUG THREADS: '1'
Getting 'https://access.redhat.com/labs/securitydataapi/cve/CVE-2016-6302.json' ...
Valid Red Hat CVE results retrieved: 1 of 1
DEBUG FIELDS: 'affected_release,threat_severity'

CVE-2016-6302
  SEVERITY: Moderate Impact
  FIXED_RELEASES:
   Red Hat Enterprise Linux 6 [openssl-1.0.1e-48.el6_8.3]: RHSA-2016:1940
   Red Hat Enterprise Linux 7 [openssl-1:1.0.1e-51.el7_2.7]: RHSA-2016:1940

[ryran]

DONE!

$ rhsecapi --help
...
CVE DISPLAY OPTIONS:
  -f, --fields FIELDS   Customize field display via comma-separated case-
                        insensitive list (default: threat_severity,
                        public_date, bugzilla, affected_release,
                        package_state); see --all-fields option for full list
                        of official API-provided fields; shorter field
                        aliases: threat_severity → severity, public_date →
                        date, affected_release → fixed_releases or fixed or
                        releases, package_state → fix_states or states;
                        optionally prepend FIELDS with plus (+) sign to add
                        fields to the default (e.g., '-f +iava,cvss3') or a
                        caret (^) to remove fields from the default (e.g., '-f
                        ^bugzilla,severity')
...

$ rhsecapi CVE-2016-6302 -f janky
rhsecapi: Field 'janky' is not a supported field; valid fields:
threat_severity, public_date, iava, cwe, cvss, cvss3, bugzilla, acknowledgement, details, statement, mitigation, upstream_fix, references, affected_release, package_state, severity, releases, fixed_releases, states, fix_states, date, fixed

$ rhsecapi CVE-2016-6302 -vf releases,severity
DEBUG THREADS: '1'
Getting 'https://access.redhat.com/labs/securitydataapi/cve/CVE-2016-6302.json' ...
Valid Red Hat CVE results retrieved: 1 of 1
DEBUG FIELDS: 'affected_release,threat_severity'

CVE-2016-6302
  SEVERITY: Moderate Impact
  FIXED_RELEASES:
   Red Hat Enterprise Linux 6 [openssl-1.0.1e-48.el6_8.3]: RHSA-2016:1940
   Red Hat Enterprise Linux 7 [openssl-1:1.0.1e-51.el7_2.7]: RHSA-2016:1940