Merge pull request kubernetes#31609 from rhcarvalho/fix-bash

Automatic merge from submit-queue

Fix Bash script

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**What this PR does / why we need it**: `cluster/mesos/docker/socat/build.sh` had two lines mixed together.

Old command output:

```
$ ./cluster/mesos/docker/socat/build.sh 
./cluster/mesos/docker/socat/build.sh: line 21: set: pipefailscript_dir=/home/rodolfo/src/k8s.io/kubernetes/cluster/mesos/docker/socat: invalid option name
```

**Special notes for your reviewer**: probably nobody is using that script? @sttts PTAL.

**Release note**:
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```release-note
NONE
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cluster/mesos/docker/socat/build.sh

@@ -18,7 +18,9 @@
 
 set -o errexit
 set -o nounset
-set -o pipefailscript_dir=$(cd $(dirname "${BASH_SOURCE}") && pwd -P)
+set -o pipefail
+
+script_dir=$(cd $(dirname "${BASH_SOURCE}") && pwd -P)
 
 cd "${script_dir}"