[FEAT] Add names expansions in templates' interfaces

[fser]

Fixes: #3623

This patch allows name expansion in templates interfaces names. For instance Interface/[FRONT|BACK]/Eth[1-10] produces the following interfaces:

Interface/FRONT/Eth1
Interface/FRONT/Eth2
Interface/FRONT/Eth3
Interface/FRONT/Eth4
Interface/FRONT/Eth5
Interface/FRONT/Eth6
Interface/FRONT/Eth7
Interface/FRONT/Eth8
Interface/FRONT/Eth9
Interface/FRONT/Eth10
Interface/BACK/Eth1
Interface/BACK/Eth2
Interface/BACK/Eth3
Interface/BACK/Eth4
Interface/BACK/Eth5
Interface/BACK/Eth6
Interface/BACK/Eth7
Interface/BACK/Eth8
Interface/BACK/Eth9
Interface/BACK/Eth10

[DanSheps]

The build is failing, please resolve the build errors before we look into this PR further.

[jeremystretch]

Per the contributing guide, only accepted issues are eligible for PRs. You are welcome to resubmit this in the event #3623 is accepted.