[test] Fix Wrapper script to properly handle arguments

[chantra]

In #4126 I solved one problem but essentially pushed it somewhere else.

Now the problem is that when multiple arguments are passed, they all end up
being within the same argument because they get wrapped within the double-quotes.

This is pretty much an escape-hell as we keep on passing the same arguments over
and over through functions and then within bash -c.

The reason for the bash -c bit is that it allows us to set some envirtonment variable used in the tests.
Those env var are set to the local environment values.

Instead of going an extra layer of indirection, we can tell sudo to preserve those
specific env var by using the --preserve-env argument this way, we do not have to
re-escape the arguments that are passed within the bash -c quoted arg.

Tests:

Confirm that this was not working before:

$ docker run -ti \
                    --privileged \
                    --network=host \
                    --pid=host \
                    -v $(pwd):/bcc \
                    -v /sys/kernel/debug:/sys/kernel/debug:rw \
                    -v /lib/modules:/lib/modules:ro \
                    -v /usr/src:/usr/src:ro \
                    -e CTEST_OUTPUT_ON_FAILURE=1 \
                    bcc-docker-focal \
                    /bin/bash -c \
                    '/bcc/build/tests/wrapper.sh \
                        c_test_all sudo /bcc/build/tests/cc/test_libbcc -s "test probing running Ruby*"'
test probing running Ruby*": -c: line 0: unexpected EOF while looking for matching `"'
test probing running Ruby*": -c: line 1: syntax error: unexpected end of file
Failed

and is fixed after the patch:

$ docker run -ti \
                    --privileged \
                    --network=host \
                    --pid=host \
                    -v $(pwd):/bcc \
                    -v /sys/kernel/debug:/sys/kernel/debug:rw \
                    -v /lib/modules:/lib/modules:ro \
                    -v /usr/src:/usr/src:ro \
                    -e CTEST_OUTPUT_ON_FAILURE=1 \
                    bcc-docker-focal \
                    /bin/bash -c \
                    '/bcc/build/tests/wrapper.sh \
                        c_test_all sudo /bcc/build/tests/cc/test_libbcc -s "test probing running Ruby*"'

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test_libbcc is a Catch v1.4.0 host application.
Run with -? for options

-------------------------------------------------------------------------------
test probing running Ruby process in namespaces
  in separate mount namespace
-------------------------------------------------------------------------------
/bcc/tests/cc/test_usdt_probes.cc:351
...............................................................................

/bcc/tests/cc/test_usdt_probes.cc:367:
PASSED:
  REQUIRE( res.msg() == "" )
with expansion:
  "" == ""

/bcc/tests/cc/test_usdt_probes.cc:368:
PASSED:
  REQUIRE( res.ok() )
with expansion:
  true

/bcc/tests/cc/test_usdt_probes.cc:371:
PASSED:
  REQUIRE( res.ok() )
with expansion:
  true

/bcc/tests/cc/test_usdt_probes.cc:374:
PASSED:
  REQUIRE( res.ok() )
with expansion:
  true

-------------------------------------------------------------------------------
test probing running Ruby process in namespaces
  in separate mount namespace and separate PID namespace
-------------------------------------------------------------------------------
/bcc/tests/cc/test_usdt_probes.cc:351
...............................................................................

/bcc/tests/cc/test_usdt_probes.cc:393:
PASSED:
  REQUIRE( res.msg() == "" )
with expansion:
  "" == ""

/bcc/tests/cc/test_usdt_probes.cc:394:
PASSED:
  REQUIRE( res.ok() )
with expansion:
  true

/bcc/tests/cc/test_usdt_probes.cc:397:
PASSED:
  REQUIRE( res.ok() )
with expansion:
  true

/bcc/tests/cc/test_usdt_probes.cc:400:
PASSED:
  REQUIRE( res.ok() )
with expansion:
  true

/bcc/tests/cc/test_usdt_probes.cc:405:
PASSED:
  REQUIRE( bcc_resolve_symname(module.c_str(), "rb_gc_mark", 0x0, ruby_pid, nullptr, &sym) == 0 )
with expansion:
  0 == 0

/bcc/tests/cc/test_usdt_probes.cc:406:
PASSED:
  REQUIRE( std::string(sym.module).find(pid_root, 1) == std::string::npos )
with expansion:
  18446744073709551615 (0xffffffffffffffff)
  ==
  18446744073709551615 (0xffffffffffffffff)

===============================================================================
All tests passed (10 assertions in 1 test case)