Skip 'shocco' code when running tox

when running tox in a devstack directory where you have previously run tox
-edocs the bashate testenv will fail as the shocco code doesn't match the
devstack style.

eg:
---
E003: Indent not multiple of 4: '           2>/dev/null ||'
 - /home/stack/projects/openstack/openstack-dev/devstack/shocco/shocco.sh : L352
<snip>
27 bashate error(s) found
---

Take the easy path and avoid running bashate in the shocco dir.

Change-Id: I5b0155332ec994afaffc5c5961902281864cff61

Author: tbreeds

tox.ini

@@ -10,19 +10,20 @@ install_command = pip install {opts} {packages}
 [testenv:bashate]
 deps = bashate
 whitelist_externals = bash
-commands = bash -c "find {toxinidir}          \
-         -not \( -type d -name .?\* -prune \) \ # prune all 'dot' dirs
-         -not \( -type d -name doc -prune \)  \ # skip documentation
-         -type f                              \ # only files
-         -not -name \*~                       \ # skip editors, readme, etc
-         -not -name \*.md                     \
-         \(                                   \
-          -name \*.sh -or                     \
-          -name \*rc -or                      \
-          -name functions\* -or               \
-          -wholename \*/inc/\* -or            \ # /inc files and
-          -wholename \*/lib/\*                \ # /lib files are shell, but
-         \)                                   \ #   have no extension
+commands = bash -c "find {toxinidir}             \
+         -not \( -type d -name .?\* -prune \)    \ # prune all 'dot' dirs
+         -not \( -type d -name doc -prune \)     \ # skip documentation
+         -not \( -type d -name shocco -prune \)  \ # skip shocco
+         -type f                                 \ # only files
+         -not -name \*~                          \ # skip editors, readme, etc
+         -not -name \*.md                        \
+         \(                                      \
+          -name \*.sh -or                        \
+          -name \*rc -or                         \
+          -name functions\* -or                  \
+          -wholename \*/inc/\* -or               \ # /inc files and
+          -wholename \*/lib/\*                   \ # /lib files are shell, but
+         \)                                      \ #   have no extension
          -print0 | xargs -0 bashate -v"
 
 [testenv:docs]