Mount plugins folder into airflow instance and change dags folder
## Type
<!-- Please choose the type of ticket. -->
- [x] Feature Request
- [ ] Bug Report
## Priority
- [X] High
- [ ] Medium
- [ ] Low
------------------------
------------------------
## Feature Request
__Why is this change needed?__
This changes is need to move dags folder to sub folder in share and mounting plugins folder to /opt/airflow/plugins
__Current behavior__
Currently the whole fileshare is mounted as dags folder
__Expected behavior__
dags mount takes subPath: dags
New mount is added for plugins
----------------------------
--------------------------
## Bug Report
<!-- If this is a bug report, fill up the following -->
__Breaking__
<!-- Is the bug breaking something. -->
- [X] YES
- [] NO
__Attached Logs?__
<!-- Please attach relevant logs. -->
- [ ] YES
- [x] NO
__Reproduction__
<!-- Please mention how often can you reproduce it. -->
__Current behavior__
<!-- Please describe the current behavior you observe -->
__Expected behavior__
<!-- Please describe the behavior you anticipate -->
__Steps to reproduce__
<!-- Please add how to reproduce the bug -->
--------------------------
--------------------------
## Other information
<!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. -->