[ACL] Add support to match on Tunnel Termination

[vivekrnv]

What I did

Add support to match an ACL rule on Tunnel Termination Flag.

Why I did it

How I verified it

Added UT and verified create_acl_entry with this attribute is working properly

vkarri@0f4071a10800:/sonic/src/sonic-swss/tests/mock_tests$ ./tests --gtest_filter="*AclTableType_Configuration*"
Running main() from /build/googletest-YnT0O3/googletest-1.10.0.20201025/googletest/src/gtest_main.cc
Note: Google Test filter = *AclTableType_Configuration*
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from AclOrchTest
[ RUN      ] AclOrchTest.AclTableType_Configuration
[       OK ] AclOrchTest.AclTableType_Configuration (12 ms)
[----------] 1 test from AclOrchTest (12 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (12 ms total)
[  PASSED ] 1 test.

Details if related

[vivekrnv]

/azpw run Azure.sonic-swss

[mssonicbld]

/AzurePipelines run Azure.sonic-swss

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).