<node tests> - Update shell_exec_func_test to create homedir in /var/tmp

Creating the user homedir in /tmp has caused issues, moving the homedir
creation to /var/tmp to prevent these issues.
Fix typo in v2_cart_model#stop_cartridge
Bug 970658

Run 'rake assets:precompile' only if that Rake task is available.
Add mindepth/maxdepth for finding manifest file.
Merge pull request #2752 from detiber/fixShellExecFuncTest

Merged by openshift-bot
Merge pull request #2762 from pmorie/dev/typo

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Merge pull request #2763 from BanzaiMan/dev/hasari/bz970658

Merged by openshift-bot
Merge pull request #2766 from mrunalp/bugs/971159

Merged by openshift-bot