Remove timeouts for Linux commands
Remove timeouts for Linux commands

* mkfs.ext4, truncate and mount can be slow in a slow machine but it is
  unlikely that they will hang.

Signed-off-by: Ed King <cb0ef010d3b7764b76e01d19f7526ae755120a2b@pivotal.io>

cloudfoundry-incubator/garden-shed,cloudfoundry-incubator/garden-shed