[Bug 1769088] [NEW] Incorrect message if /snap/bin is not in PATH

[Michael Vogt]

Public bug reported:

When the user installs a snap (like slack) but does not have /snap/bin in PATH the message is very confusing:
```
$ sudo snap install slack
...
$ slack

Command 'slack' not found, but can be installed with:
sudo apt  install slack              
```

The fix is that /snap/bin needs to be considered by c-n-f so that it can say:
```
command 'slack' is available in '/snap/bin/slack'
The command could not be located because '/snap/bin' is not included in the PATH environment variable.
slack: command not found
```

** Affects: command-not-found (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: command-not-found (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: command-not-found (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1769088

Title:
  Incorrect message if /snap/bin is not in PATH

Status in command-not-found package in Ubuntu:
  New
Status in command-not-found source package in Bionic:
  New

Bug description:
  When the user installs a snap (like slack) but does not have /snap/bin in PATH the message is very confusing:
  ```
  $ sudo snap install slack
  ...
  $ slack

  Command 'slack' not found, but can be installed with:
  sudo apt  install slack              
  ```

  The fix is that /snap/bin needs to be considered by c-n-f so that it can say:
  ```
  command 'slack' is available in '/snap/bin/slack'
  The command could not be located because '/snap/bin' is not included in the PATH environment variable.
  slack: command not found
  ```

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