v2.10.0-beta.7

Multiple fixes (#227)

Replace a third party lib method we used to parse the input from
`--endpoints`. With the changes we will both have a shorthand `-e` and
also accept the input in a much more user friendly way like `-e
"10.71.26.0:5705,10.71.27.116:5705"` or `-e "10.71.26.0:5705,
10.71.27.116:5705"`
To that I also added an example to the flag that shows a clear example: 
```
-e, --endpoints strings   set the list of endpoints used when connecting to the StorageOS API in the form of "10.71.26.0:5705, 10.71.27.116:5705" (default [http://localhost:5705])
```

Fix a bug with the filtering of volumes based on their healths (if
statement was incorrectly enabling the filtering)

Run go mod tidy