fix(nemesis): remove dead connbytes test, fix docstring port, fix double-unit bug

- Remove connbytes test case (branch was removed from production code)
- Fix RejectThriftNetworkMonkey docstring: port 9100 -> 9160
- Fix BlockNetworkMonkey._disrupt_k8s: additional_info used 'for {duration}sec'
  where duration is already '60s', producing 'for 60ssec'; drop the redundant 'sec'

(cherry picked from commit 6fd8678)

Author: pehala

unit_tests/unit/nemesis/monkey/test_network.py

@@ -108,12 +108,6 @@ def test_install_iptables(is_ubuntu, should_install):
             "-m statistic --mode nth --every 8 --packet 0",
             id="statistic-nth",
         ),
-        pytest.param(
-            ["connbytes", "800"],
-            "every packet from connection that total byte counter exceeds 800",
-            "-m connbytes --connbytes-mode bytes --connbytes-dir both --connbytes 800",
-            id="connbytes",
-        ),
     ],
 )
 def test_matching_rule(choices, expected_desc, expected_rule):