M3-cli

* Removed walrus operator

* Reworked the boolean parameters from key-value pairs to flags:
* The presence of a flag parameter is regarded as a `true` value;
* The absence of a flag parameter is regarded as a `false` value.
* Improved the output of the `add-schedule-instances` and `delete-schedule-instances` commands
* Hid the `tenantState` from the response of the `describe-tenants` command
* Changes to the `describe-aws-stack-events` command:
* Fixed validation of the `eventId` and `resourceId` parameters;
* Removed the `AUTHORIZATION` value from the `searchType` parameter;
* Dropped the `customerName` parameter.

* Update variables format for `terraform-apply-template` and `terraform-plan-template` commands:
* `--variables key:value` for a string;
* `--variables key:"value1, value2, value3"` for a list;
* `--variables key1:"key2=value2"` for an object.
* Remove parameter `variables` for `terraform-destroy-template`
* Interface of `update-keypair-region` updated: parameters `region` and `cloud` have become required
* Modified `import-keypair` command

* Use correct help for `tenantName` parameter
* Remove obsolete commands: `activate-service`, `describe-platform-service-availability`

* Fixed output for report commands
* `cloud` parameter in command `import-keypairs` has become required
* `email` parameter in command `management-console` has become optional
* `scheduleOwner` parameter in command `create-schedule` has become optional
* Fixed issue with command's help that stores in the file `commands_help.py`
* Added parameter `region` to the command `subtotal-report`

* interface of `describe-aws-stack-events` updated: parameter `tenant` is replaced with `tenantName`
* integration request of `describe-aws-stack-events` has been removed
* commands_def version 2.7