set default for SERVICED_ADMIN_GROUP depending on Ubuntu or RHEL7
Merge pull request #1202 from control-center/feature/CC-330

set default for SERVICED_ADMIN_GROUP depending on Ubuntu or RHEL7
removed executable code for SERVICED_MAX_CONTAINER_AGE
Merge pull request #1204 from control-center/feature/CC-333

removed executable code for SERVICED_MAX_CONTAINER_AGE
for RHEL/Centos default wheel group instead of sudo as SERVICED_ADMIN_GROUP for UI
authenticate works only when iterating over num_groups instead of _CP_MAX_GROUPS
Merge pull request #1205 from control-center/feature/CC-324.2

Feature/cc 324.2
remove nsenter and its dependence on sudo
removed extraneous dependence on tree command
remove carriage return from output of service attach
enable debugging for test_attached
wait 5 minutes when failed
use script to trick docker exec into thinking caller is interactive tty