Create the display-message-configuration policy
## Purpose
Need to display a message on the lock screen when the device owner is enabled, Need to display a message on the device administrators apps and the disabled settings
## Goals
Need to create a policy to show those messages on the devices
## Approach
Create a policy to show those messages on the device
## Screenshots
![Screenshot_from_2019-11-03_15-13-34](/uploads/2864b93e78a88f3f3d895e55450eeab5/Screenshot_from_2019-11-03_15-13-34.png)
![Screenshot_from_2019-11-05_00-32-45](/uploads/26238a9da284ea621db232e2147b8e56/Screenshot_from_2019-11-05_00-32-45.png)
![Screenshot_20191105-003837_Settings](/uploads/54003b98cd443152f3131d33d71d2669/Screenshot_20191105-003837_Settings.jpg)
![Screenshot_20191105-003848_Settings](/uploads/b185c1ae37b3035af0857848bc8e6f9b/Screenshot_20191105-003848_Settings.jpg)
![Screenshot_20191105-003823_Entgra_Device_Management_Agent](/uploads/b4678d3ec70609d74f107538884f5656/Screenshot_20191105-003823_Entgra_Device_Management_Agent.jpg)
![Screenshot_20191105-112022_Settings](/uploads/5f7e39e0272ea4e3e64929573df45afe/Screenshot_20191105-112022_Settings.jpg)
## Documentation
Android Developer
https://developer.android.com/reference/android/app/admin/DevicePolicyManager.html#setDeviceOwnerLockScreenInfo(android.content.ComponentName,%20java.lang.CharSequence)https://developer.android.com/reference/android/app/admin/DevicePolicyManager#setLongSupportMessage(android.content.ComponentName,%20java.lang.CharSequence)https://developer.android.com/reference/android/app/admin/DevicePolicyManager#setShortSupportMessage(android.content.ComponentName,%20java.lang.CharSequence)
## Automation tests
- Unit tests
N/A
- Integration tests
N/A
## Security checks
- Followed secure coding standards? (yes)
- Ran FindSecurityBugs plugin and verified report? (no)
- Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? (yes)
## Related MRs
N/A
## Test environment
Ubuntu 18.04
## Learning
N/A
See merge request entgra/carbon-device-mgt-plugins!109