Add MTU adjustment checks in remote VLAN examples

[ljkiraly]

Signed-off-by: Laszlo Kiraly [email protected]

Description

The MTU value of the interface in NSC can not be bigger than the MTU value set on base interface

Issue link

#7738

How Has This Been Tested?

• [ ] Added unit testing to cover
• [X] Tested manually
• [X] Tested by integration testing
• [ ] Have not tested

Types of changes

• [X] Bug fix
• [ ] New functionallity
• [ ] Documentation
• [ ] Refactoring
• [ ] CI