M3-cli

* The `update-platform-service` command has the following changes:
* changed the alias name from `pver` to `providerv` in the `provider-version` parameter
* changed the alias name from `pver` to `productv` in the `product-version` parameter

* Improved `describe-tenants` command, the `all` parameter was replaced with the `hidden`,
* it is possible to use `hidden` and `inactive` parameters separately and both

* The `publish-service` command has the following changes:
* the `operating-system` parameter was set as not `required`
* the `delivery-method` parameter was set as not `required` and has the `Maestro` value by default
* improved the descriptions for the following parameters:
* `tenant-name`
* `cloud`
* The function of encoding of the picture moved to the plugin_utilities.py file
* Added the Regex validation for `terraform-version` parameter in the terraform-upload-template command
* Added the ability to specify default values for required command parameters in the
`m3.properties` file in the user's current working directory. Default values from the
`m3.properties` file take precedence over default values from the `default.cr` file
in the user's home directory.
* Removed the `path` parameter from the `access` command as obsolete.
* Removed the `M3CLI_PARAMETER_SET_NAME` environment variable as obsolete.

* Fixed the interactive options if no default fields are available
* The `create-keypair` command has following changes:
* the `access_key` and `secret_key` write to the local file to the `%HOME/.m3cli/keys/` path by default
* added the ability to specify the `path` to save keys

* Commands `describe-public-tag` and `delete-public-tag` was implemented, the `set-public-tag` command was improved:
* by default command will add new tag instead of overwriting existing, added `overwrite` flag to make it possible overwrite existing tags

* Added the following parameters to the `publish-service` command:
* `tenant-name` - the tenant display name
* `cloud` - the cloud provider
* Renamed the following alias in the `publish-service` command:
* from `pver` to `providerv`;
* from `pver` to `productv`