Commits on Sep 17, 2021

1. feat: add support for common v2 endpoints (ping/metrics/version/config) …

   This commit adds v2 (Ireland/Jakarta) support for four common endpoints:
   - version
   - metrics
   - ping
   - config
   
   For information about the available commands, use `edgex-cli -h`
   
   There are a number of ways to use the commands:
   1. `edgex-cli version` displays version of each active microservice.
   The version commands just shows the version string. The other commands
   use a pretty-printed JSON structure.
   
   2. `edgex-cli version -d` shows debug output - the URL used and the result
   
   3. `edgex-cli version -j` gets the raw JSON output for one service (by default core-data)
   
   It's also possible to specify the service to use. : `-m/--metadata`, `-c/--command`,
    `-n/--notification`, `-s/--scheduler` or `--data` (which is the default).
   This can also be combined with `-j` or `-d`
   
   Example:
   - `$ edgex-cli metrics -j -m`
   - `$ edgex-cli ping -d --command`
   
   Help is available with
   ```
   $ edgex-cli help
   $ edgex-cli version --help
   $ edgex-cli version --h
   ```
   
   Signed-off-by: Siggi Skulason <siggi.skulason@canonical.com>

   Siggi Skulason committed Sep 17, 2021
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