[PATCH 1/1] tests: use common shebang in "packetpath/flowtables" test

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"./tools/check-tree.sh" checks for a certain shebang. Either `/bin/bash` or
`/bin/bash -e`. No other are currently allowed, because it makes sense to be
strict/consistent and there is no need such flexibility.

Move the "-x" to a later command.

Note that "set -x" may not be a good choice anyway. If you want to debug
a test and see the shell commands, you could just run

  $ ./tests/shell/run-tests.sh tests/shell/testcases/packetpath/flowtables -x

That will automatically use `/bin/bash -x` as interpreter. And that
works for all tests the same. This is also the reason why
"check-tree.sh" checks for a well-known shebang. Because the "-x" option
of the test runner mangles the shebang, but for that it needs to
understand it.

Signed-off-by: Thomas Haller <thaller@xxxxxxxxxx>
Btw, "check-tree.sh" also complains about lack of .nft/.nodump file.
The test should get one of these (depending on what's appropriate). You
can generate them with

    $ ./tests/shell/run-tests.sh tests/shell/testcases/packetpath/flowtables -g

 tests/shell/testcases/packetpath/flowtables | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/shell/testcases/packetpath/flowtables b/tests/shell/testcases/packetpath/flowtables
index 852a05c6d0ab..b962984fb6ec 100755
--- a/tests/shell/testcases/packetpath/flowtables
+++ b/tests/shell/testcases/packetpath/flowtables
@@ -1,7 +1,9 @@
-#! /bin/bash -x
+set -x
 rnd=$(mktemp -u XXXXXXXX)

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