Support Bulk Operation for Instance Lifecycle

##### ISSUE TYPE

* Feature Idea

##### COMPONENT NAME

~~~
Instance Lifecycle
~~~

##### CLOUDSTACK VERSION

~~~
N/A
~~~

##### CONFIGURATION

##### OS / ENVIRONMENT

##### SUMMARY

As an Admin, if i have a need to use Instance Lifecycle Operations, 95% of the time, it is for a group of VMs with similar natures.

Right now, the implementation of the 'Schedule Lifecycle Operations' feature is done on a per vm basis.

This means, user needs to go to each VM individually, and configure a scheduler. In this case, if i have 100 VMs that needs to have a scheduled restart, id have to manually configure it 100 times, the same settings.

Its because of this, i personally use Ansible + Semaphore with a cron job to achieve this, and not the schedule feature in cloudstack.

As a feature request, i would like to request to enhance VMs in a 'Instance Group' to be allowed to share the same scheduled job. That way, as a user, it would be much more easier to use, manage and troubleshoot.

##### STEPS TO REPRODUCE

~~~
None
~~~

##### EXPECTED RESULTS

~~~
Able to Bulk Operate a VM Schedule job using Instance Groups
~~~

##### ACTUAL RESULTS

~~~
User needs to go to each VM individually, and configure a scheduler
~~~

未指定文件、测试或入口点。首先检查 CloudStack 现有的 Schedule Lifecycle Operations 和 Instance Group 行为，然后确定应如何表示和管理共享的计划任务；完成的标准是 Instance Group 可以对一个 VM 计划任务执行批量操作。

由索引模型根据 Issue 内容生成。