fix: fixed intra-evc source flows destination proxy port

[viniarck]

Closes #49 Closes #48 Closes #24 Closes #36

Summary

• Fixed intra-evc source flows destination proxy port, data plane is now working
• Avoided extra redundant 'set_vlan' for intra-evc' (This NApp hasn't been released yet no need to update changelog)

Local Tests

• Tested the data plane on NoviFlow lab using Novi01 and Novi06.

                        +--------+
                        |        |
                        |        |
                        |        |
                        |        |
                     17 |      18|
               +--------+--------v--+
               |                    | 19
         15    |                    +-----------+
 --------------+                    |           |
               |                    |           |
               |      sw1           |           |
        16     |                    |20         |
---------------+                    <-----------+
               |                    |
               |                    |
               +--------------------+

• Novi01 intra-EVC symmetric vlan 100 between ports 15 and 16, and loops on 17-18, 19-20 respectively
• Novi01 intra-EVC assymetric vlan 201-200 between ports 15 and 16, and loops on 17-18, 19-20 respectively

(I've also collected the stored flows that will be used for unit tests, including on sdntrace_cp)

End-to-End Tests

N/A

[viniarck]

Test cov went up by 17%, since we didn't have much cov of the flow builder part yet.