Remove old inventory warnings

[sandbergja]

This resolves the following warnings:

[WARNING]:  * Failed to parse /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/production with ini plugin: /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/production:12: Section [production:children] includes undefined group: cicognara_production [WARNING]:  * Failed to parse /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/production with yaml plugin: We were unable to read either as JSON nor YAML, these are the errors we got from
each: JSON: Expecting value: line 1 column 2 (char 1)  Syntax Error while loading YAML.   did not find expected <document start>  The error appears to be in
'/Users/sandbergj/repos/princeton_ansible/inventory/by_environment/production': line 2, column 1, but may be elsewhere in the file depending on the exact syntax problem.  The offending line appears to be:
[production:children] abid_production ^ here
[WARNING]: Unable to parse /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/production as an inventory source
[WARNING]:  * Failed to parse /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/staging with ini plugin: /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/staging:11: Section
[staging:children] includes undefined group: cicognara_staging
[WARNING]:  * Failed to parse /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/staging with yaml plugin: We were unable to read either as JSON nor YAML, these are the errors we got from each:
JSON: Expecting value: line 1 column 2 (char 1)  Syntax Error while loading YAML.   did not find expected <document start>  The error appears to be in
'/Users/sandbergj/repos/princeton_ansible/inventory/by_environment/staging': line 2, column 1, but may be elsewhere in the file depending on the exact syntax problem.  The offending line appears to be:
[staging:children] abid_staging ^ here
[WARNING]: Unable to parse /Users/sandbergj/repos/princeton_ansible/inventory/by_environment/staging as an inventory source

[kayiwa]

thanks @sandbergja