feat(efa): add validation for EFA on single node

[mselim00]

Issue #, if available:

Description of changes:
The EFA installer comes with a utility to validate the installation by ping ponging traffic over EFA on localhost. This adds a step to run that in the unit test.

Sample test output:

=== RUN   TestPingPong
=== RUN   TestPingPong/pingpong
    pingpong_test.go:155: need at least 2 nodes with EFA capacity, got 1
--- FAIL: TestPingPong (0.07s)
    --- FAIL: TestPingPong/pingpong (0.07s)
=== RUN   TestUnit
=== RUN   TestUnit/unit
=== RUN   TestUnit/unit/Unit_test_succeeds
=== NAME  TestUnit/unit
    unit_test.go:132: Logs for pod "efa-unit-0"
        Running test on a g5.24xlarge
        provider: efa
            fabric: efa-direct
            domain: rdmap0s26-rdm
            version: 201.0
            type: FI_EP_RDM
            protocol: FI_PROTO_EFA
        provider: efa
            fabric: efa
            domain: rdmap0s26-rdm
            version: 201.0
            type: FI_EP_RDM
            protocol: FI_PROTO_EFA
        provider: efa
            fabric: efa
            domain: rdmap0s26-dgrm
            version: 201.0
            type: FI_EP_DGRAM
            protocol: FI_PROTO_EFA
        Verified at least 1 DGRAM endpoint(s) are available (found 1)
        Verified at least 1 RDM endpoint(s) are available (found 2)
        Running single-node efa test
        Localhost fi_pingpong test: Attempt 1 (max 3)...
        Starting server on port 49220...
        Starting client on port 64270...
        Server Log:
        bytes   #sent   #ack     total       time     MB/sec    usec/xfer   Mxfers/sec
        64      10      =10      1.2k        0.00s      0.87      73.20       0.01
        256     10      =10      5k          0.00s     15.61      16.40       0.06
        1k      10      =10      20k         0.00s     61.50      16.65       0.06
        4k      10      =10      80k         0.00s    227.56      18.00       0.06
        Client Log:
        bytes   #sent   #ack     total       time     MB/sec    usec/xfer   Mxfers/sec
        64      10      =10      1.2k        0.00s      0.88      72.65       0.01
        256     10      =10      5k          0.00s     16.15      15.85       0.06
        1k      10      =10      20k         0.00s     63.80      16.05       0.06
        4k      10      =10      80k         0.00s    235.40      17.40       0.06
        fi_pingpong: SUCCESS!
        Success!
--- PASS: TestUnit (10.15s)
    --- PASS: TestUnit/unit (10.15s)
        --- PASS: TestUnit/unit/Unit_test_succeeds (10.01s)
FAIL
FAIL    github.com/aws/aws-k8s-tester/test/cases/efa    31.243s
FAIL

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.