Previously, if a container had healthchecks disabled in the
docker-compose.yml file and the user did a `podman inspect <container>`,
they would have an incorrect output:
```
"Healthcheck":{
"Test":[
"CMD-SHELL",
"NONE"
],
"Interval":30000000000,
"Timeout":30000000000,
"Retries":3
}
```
After a quick change, the correct output is now the result:
```
"Healthcheck":{
"Test":[
"NONE"
]
}
```
Additionally, I extracted the hard-coded strings that were used for
comparisons into constants in `libpod/define` to prevent a similar issue
from recurring.
Closes: #14493
Signed-off-by: Jake Correnti <jcorrenti13@gmail.com>
5633ef1d15