Updated error message displayed when cookbook unshare fails. Addresses https://github.com/chef/chef/issues/8056
Updated error message displayed when cookbook unshare fails. Addresses https://github.com/chef/chef/issues/8056

Signed-off-by: Vikram Karve <ea14c0b25fe0acfd92598c32b016964d39d6037a@progress.com>

gene1wood/chef,tas50/chef-1,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,chef/chef,gene1wood/chef,tas50/chef-1,chef/chef,gene1wood/chef,tas50/chef-1,MsysTechnologiesllc/chef,tas50/chef-1,chef/chef,gene1wood/chef,chef/chef