[vstest]: Fix MACsec test in the kernel 5.15 (sonic-net#3573)

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**What I did**
Provide an explicit value for send_sci in the macsec vstest

**Why I did it**

The kernel 5.15 requires the send_sci to be true if the sci value was provided explicitly.

**How I verified it**

```
AzDevOps@test-os-u000048:/agent/_work/1/s/sonic-swss/tests$ sudo pytest --dvsname=vs test_macsec.py --pdb
=========================================================================================== test session starts ============================================================================================
platform linux -- Python 3.8.10, pytest-4.6.2, py-1.11.0, pluggy-0.13.1
rootdir: /agent/_work/1/s/sonic-swss/tests
plugins: flaky-3.7.0
collected 4 items

test_macsec.py .... [100%]

============================================================================================= warnings summary =============================================================================================
test_macsec.py:311
 /agent/_work/1/s/sonic-swss/tests/test_macsec.py:311: PytestAssertRewriteWarning: assertion is always true, perhaps remove parentheses?
 assert(

test_macsec.py:278
 /agent/_work/1/s/sonic-swss/tests/test_macsec.py:278: PytestAssertRewriteWarning: assertion is always true, perhaps remove parentheses?
 assert(

test_macsec.py:251
 /agent/_work/1/s/sonic-swss/tests/test_macsec.py:251: PytestAssertRewriteWarning: assertion is always true, perhaps remove parentheses?
 assert(

test_macsec.py:258
 /agent/_work/1/s/sonic-swss/tests/test_macsec.py:258: PytestAssertRewriteWarning: assertion is always true, perhaps remove parentheses?
 assert(

test_macsec.py:264
 /agent/_work/1/s/sonic-swss/tests/test_macsec.py:264: PytestAssertRewriteWarning: assertion is always true, perhaps remove parentheses?
 assert(

-- Docs: https://docs.pytest.org/en/latest/warnings.html
================================================================================== 4 passed, 5 warnings in 78.32 seconds ===================================================================================
```

**Details if related**

Author: mssonicbld

tests/test_macsec.py

@@ -424,6 +424,7 @@ def init_macsec(
         wpa.init_macsec_port(port_name)
         wpa.config_macsec_port(port_name, {"enable_protect": True})
         wpa.config_macsec_port(port_name, {"enable_encrypt": True})
+        wpa.config_macsec_port(port_name, {"send_sci": True})
         wpa.config_macsec_port(
             port_name,
             {