fix basename: illegal option -- b issue with upstream filenames starting with -

issue:
```
xiaods at XiaoTommydeMacBook-Pro in ~/go/src/github.com/openshift/origin on devel*
$ export PATH="${PATH}:$( source hack/lib/init.sh; echo "${OS_OUTPUT_BINPATH}/$( os::build::host_platform )/" )"
basename: illegal option -- b
usage: basename string [suffix]
       basename [-a] [-s suffix] string [...]
```
caused by :

The -- (dash dash) stops basename from processing any options in the argument.
Always quote $0 in case there are spaces in the name.

Author: xiaods

hack/lib/init.sh

@@ -50,8 +50,10 @@ os::log::stacktrace::install
 # them before every invocation.
 os::util::environment::update_path_var
 
-if [[ -z "${OS_TMP_ENV_SET-}" ]]; then
-	os::util::environment::setup_tmpdir_vars "$( basename "$0" ".sh" )"
+if "$0" ~= *.sh; then
+   os::util::environment::setup_tmpdir_vars "$( basename "$0" ".sh" )"
+else
+    os::util::environment::setup_tmpdir_vars "shell"
 fi
 
 # Allow setting $JUNIT_REPORT to toggle output behavior