Fix errant, newline-including log directory.
Fix errant, newline-including log directory.

We've seen cases where a directory named "cluster\n  " sneaks
into the logs directory. The intention is that $IMPALA_ALL_LOGS_DIRS
is a space-separated list, but clean.sh (as opposed to buildall.sh)
treats it as a single argument.

I tested this manually:

Before:

  $ls logs/
  be_tests/  custom_cluster_tests/  data_loading/  ee_tests/  fe_tests/

Bad command:

  $mkdir -p "${IMPALA_ALL_LOGS_DIRS}"

After:

  $ls logs/
  be_tests/  cluster?  /  custom_cluster_tests/  data_loading/  ee_tests/
  fe_tests/

Change-Id: Id18404c3f3fc0008f67b01afbac9d908532fc317
Reviewed-on: http://gerrit.cloudera.org:8080/8459
Reviewed-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala