Bump dev version to 11.8.0.alpha.0

Ongoing bugfixes for 11.6.0 release will occur in the 11-stable branch.
shell_out to diff => diff-lcs, cleaned up tests, updated gem versions
required diff libraries
[CHEF-4380] Fix missing include on shellout mixin
Added license information
IO:: -> IO.
Merge pull request #899 from juliandunn/CHEF-4380

[CHEF-4380] Fix missing include on shellout mixin
changed Ohai -> Chef in NOTICE
Merge pull request #898 from opscode/OC-8693

OC-8693
Provider class for Mount on AIX
mount functional test, inprogress
add negative test foe mount and umount
load provider as per platform
add functional tests for remount.
Mount for AIX (added code for enable and disable actions
Mount changes for AIX (added code for enable/disable actions
require aix mount provider
create ramdisk as per platform for mount functional tests.
add mount enable-disable functional test cases
fix formatting and remove non-overridden methods.