Don't pollute the global gem cache with gems for the crowbar framework [2/2]

This pull requests does two things:
 * Install crowbar framework gems with bundle install --path vendor/bundle instead of just using bundle install.  This keeps bundler inadvertently interfering with external commands that might use different versions of the gems the framework requires.
 * Fix up /etc/environment handling to not mangle the path quite as much.  Since we no longer have duplicate knife and chef-client commands lying around, we no longer need to mess with $PATH in an attempt to make sure the right one gets used.


 .../master/extra/install-crowbar-native.sh         |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Crowbar-Pull-ID: 94c0227ddb31f0e37eda928591c5b68de4dc9b4d

Crowbar-Release: development