Update arista_eos_show_interfaces.textfsm

[RasmusThing]

Added support for subinterfaces like Ethernet49/1 for 100GE ports.

[FragmentedPacket]

Do you mind bringing those into the original PRs and then closing out those PRs?

Each PR should include the following files that pertain to an issue/enhancement:

1. Changes to the template.
2. New .raw file that includes the raw output from the device and within the correct test directory.
3. New .yml file that includes the correctly parsed data using the changes from the template and within the correct test directory.

There is an included utility we provide that will parse the .raw file and provide the .yml (development_scripts.py) and more information regarding that can be found in our README. We recommend checking the auto-generated .yml file to make sure it does capture everything appropriately.

If you need help, you can find us on our Network to Code Slack.

[FragmentedPacket]

@Kosire What issue are you having with this? Looking at the raw output you provided in #682, it parses fine except for link_status which is fixed in the PR below.

We can continue discussion on #711