Beaker 2.24.0 release

Bug

• [BKR-505] - `confine_block` skips remainder of test if matching hosts list is ever emptied
• [BKR-506] - FQDN contains trailing dot
• [BKR-519] - Beaker prints invisible messages in debug mode (black-on-black)
• [BKR-520] - Make curl commands compatible with AIX
• [BKR-523] - Beaker prints error message on exit when using docker containers

Improvement

• [BKR-431] - Fetch AWS credentials from environment variables
• [BKR-455] - use of both :accept*exit_codes options for on() et al. should warn
• [BKR-531] - react to new osx name structure

New Feature

• [BKR-482] - Add support for OSX 10.11 El Capitan (x86_64)
• [BKR-515] - host_name_prefix to distinguish instances
• [BKR-516] - openstack needs to support more envs

Task

• [BKR-514] - increase polling timeout when requesting vpool instances