Handle quoted args

[kpedro88]

In order to assign $@ to another variable while preserving quoted arguments, it's necessary to assign it as an array. (This comes from https://stackoverflow.com/questions/3811345/how-to-pass-all-arguments-passed-to-my-bash-script-to-a-function-of-mine; I did not figure it out myself...)

Here's the test, which can be run to show how the current version gives the wrong answer (4). The version in this PR gives the right answer (3).

cat << 'EOF' > testArgs.sh
#!/bin/bash
ARGS=("$@")
echo ${#ARGS[@]}
EOF
chmod +x testArgs.sh
./testArgs.sh 1 "2 3" 4
cmssw-env --cmsos cc6 -B $PWD --pwd $PWD -- ./testArgs.sh 1 "2 3" 4

I also removed the sh -c call, which seemed superfluous; if it's not, let me know and I'll put it back.

[cmsbuild]

A new Pull Request was created by @kpedro88 (Kevin Pedro) for branch master.

@cmsbuild, @smuzaffar, @mrodozov, @iarspider can you please review it and eventually sign? Thanks. @silviodonato, @dpiparo, @qliphy you are the release manager for this. cms-bot commands are listed here

[smuzaffar]

thanks @kpedro88 , this looks good