title: Can't run " oc rsh POD mysqldump foo" on openshift v3
body: <p>I have installed oc and login openshift on my linux pc. 
  When i running</p>
  
  <pre><code>oc rsh mysql-55-centos7-1-1aa3 ls -al /tmp/
  total 72428
  drwxrwxrwt. 1 root       root       35 Oct 30 00:38 .
  drwxr-xr-x. 1 root       root       39 Oct 23 23:53 ..
  drwxrwxrwt. 2 root       root        6 Nov  2  2016 .ICE-unix
  drwxrwxrwt. 2 root       root        6 Nov  2  2016 .Test-unix
  drwxrwxrwt. 2 root       root        6 Nov  2  2016 .X11-unix
  drwxrwxrwt. 2 root       root        6 Nov  2  2016 .XIM-unix
  drwxrwxrwt. 2 root       root        6 Nov  2  2016 .font-unix
  -rwx------. 1 root       root      827 Nov  2  2016 ks-script-la2kM
  -rwxr-xr-x. 1 1063070000 root  3343400 Oct 24 04:08 mysql
  </code></pre>
  
  <p>it works, but</p>
  
  <pre><code>oc rsh mysql-55-centos7-1-1aa3 mysqldump -h1.1.1.1 -uuser -ppassword data1 &gt; /tmp/data1.sql
  
  command terminated with exit code 126
  </code></pre>
  
  <p>it doesn't work</p>
  
  <pre><code>oc rsh mysql-55-centos7-1-1aa3 mysqldump
  
  rpc error: code = 13 desc = invalid header field value "oci runtime error: exec failed: container_linux.go:247: starting container process caused \"exec: \\\"mysqldump\\\": executable file not found in $PATH\"\n"
  
  command terminated with exit code 126
  </code></pre>
  
  <p>How to solve the problem ?</p>