…OFF pause frames (sonic-net#783)

### Description of PR
This PR adds a new test under tests/counter/ to verify that receiving
IEEE 802.3x pause frames (XON/XOFF) does not incorrectly increment
RX_DROP counters on the DUT

Summary:
Fixes sonic-net#20499

### Type of change

- [ ] Bug fix
- [ ] Testbed and Framework(new/improvement)
- [x] New Test case
    - [ ] Skipped for non-supported platforms
- [ ] Test case improvement

### Approach
#### What is the motivation for this PR?
The motivation is to address [Issue
sonic-net#20499](https://github.com/sonic-net/sonic-mgmt/issues/20499?utm_source=chatgpt.com)

#### How did you do it?
I implemented a new test test_xon_xoff_does_not_increase_rx_drop under
tests/counter/.
The test selects a random operational DUT port.
It maps the DUT port to a PTF port index using
tbinfo['topo']['ptf_map'].
It crafts valid IEEE 802.3x PAUSE frames (both XOFF with pause_time > 0
and XON with pause_time == 0).
Frames are transmitted from the PTF host towards the DUT.
RX_DROP counters are read before and after transmission using
sonic-db-cli or redis-cli.
The test asserts that RX_DROP does not increase.

#### Any platform specific information?
No platform-specific dependencies.

#### Supported testbed topology if it's a new test case?
The test supports topologies t0 and t1

Change in this updat:
    b39e746 Spell check fixes (sonic-net#783)
    373be80 [build-vm] Don't Install Lib Boost 1.67 (sonic-net#784)

signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>

…nch (sonic-net#2526)

* [submodule 201811] advance sairedis and swss submodule for 201811 branch

Submodule src/sonic-sairedis 60f97c3..bdb0074:
  > Add more information on failed map sizes (sonic-net#416)
  > Add WRED specific comparison logic (sonic-net#413)
  > Initialize notification queue pointer before switch create (sonic-net#411)
  > Add log info for not matching SG/IPG/QUEUES (sonic-net#409)
  > Add support for any number of ports in virtual switch using lane map (sonic-net#407)

Submodule src/sonic-swss 85f6322..65a0256:
  > Increase the watermark polling interval to 10s (sonic-net#777)
  > [vstest]: fix test_port_an_warm.py test (sonic-net#779)
  > [wartermarkorch] Fix repeated m_pg_ids and m_unicast_queue_ids add up issue (sonic-net#752)
  > [teammgrd] Fix inconsistent port admin status (sonic-net#755)
  > Remove AclTableGroup upon removal of port/lag/vlan (sonic-net#751)


Signed-off-by: Ying Xie <ying.xie@microsoft.com>

* [submodule] advance sonic-swss submodule

Submodule src/sonic-swss 65a0256..bf21ee3:
  > On a routing vlan, the neighbor entry in the /31 subnet is not added … (sonic-net#784)
  > portsorch ports init done flag should means buffer, autoneg, speed, m… (sonic-net#747) (sonic-net#783)

Signed-off-by: Ying Xie <ying.xie@microsoft.com>