tc-testing: Correct compound statements for namespace execution

If tdc is executing test cases inside a namespace, only the
first command in a compound statement will be executed inside
the namespace by tdc. As a result, the subsequent commands
are not executed inside the namespace and the test will fail.

Example:

for i in {x..y}; do args="foo"; done && tc actions add $args

The namespace execution feature will prepend 'ip netns exec'
to the command:

ip netns exec tcut for i in {x..y}; do args="foo"; done && \
  tc actions add $args

So the actual tc command is not parsed by the shell as being
part of the namespace execution.

Enclosing these compound statements inside a bash invocation
with proper escape characters resolves the problem by creating
a subshell inside the namespace.
Signed-off-by: Lucas Bates <lucasb@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/tc-testing/tc-tests/actions/gact.json

@@ -481,7 +481,7 @@
                 255
             ]
         ],
-        "cmdUnderTest": "for i in `seq 1 32`; do cmd=\"action pass index $i \"; args=\"$args$cmd\"; done && $TC actions add $args",
+        "cmdUnderTest": "bash -c \"for i in \\`seq 1 32\\`; do cmd=\\\"action pass index \\$i \\\"; args=\"\\$args\\$cmd\"; done && $TC actions add \\$args\"",
         "expExitCode": "0",
         "verifyCmd": "$TC actions list action gact",
         "matchPattern": "^[ \t]+index [0-9]+ ref",
@@ -505,7 +505,7 @@
                 255
             ]
         ],
-        "cmdUnderTest": "for i in `seq 1 32`; do cmd=\"action continue index $i cookie aabbccddeeff112233445566778800a1 \"; args=\"$args$cmd\"; done && $TC actions add $args",
+        "cmdUnderTest": "bash -c \"for i in \\`seq 1 32\\`; do cmd=\\\"action continue index \\$i cookie aabbccddeeff112233445566778800a1 \\\"; args=\"\\$args\\$cmd\"; done && $TC actions add \\$args\"",
         "expExitCode": "0",
         "verifyCmd": "$TC actions list action gact",
         "matchPattern": "^[ \t]+index [0-9]+ ref",
@@ -528,9 +528,9 @@
                 1,
                 255
             ],
-            "for i in `seq 1 32`; do cmd=\"action continue index $i \"; args=\"$args$cmd\"; done && $TC actions add $args"
+            "bash -c \"for i in \\`seq 1 32\\`; do cmd=\\\"action continue index \\$i \\\"; args=\\\"\\$args\\$cmd\\\"; done && $TC actions add \\$args\""
         ],
-        "cmdUnderTest": "for i in `seq 1 32`; do cmd=\"action gact index $i \"; args=\"$args$cmd\"; done && $TC actions del $args",
+        "cmdUnderTest": "bash -c \"for i in \\`seq 1 32\\`; do cmd=\\\"action gact index \\$i \\\"; args=\"\\$args\\$cmd\"; done && $TC actions del \\$args\"",
         "expExitCode": "0",
         "verifyCmd": "$TC actions list action gact",
         "matchPattern": "^[ \t]+index [0-9]+ ref",