Bulk update of choices=BOOLEANS to type='bool'
Bulk update of choices=BOOLEANS to type='bool'
Merge pull request #6408 from risaacson/migrate_booleans_bool_digital_ocean

Bulk update of choices=BOOLEANS to type='bool'
Merge pull request #6409 from risaacson/migrate_booleans_bool_ec2_eip

Bulk update of choices=BOOLEANS to type='bool'
Fix ec2_facts module by removing stray fail statement
Remove duplicate digital_ocean_droplet module
Changelog updates for things merged already into 1.6
Fixes #6411 Return None for ec2 api endpoints that return 404
Micro-optimization of inventory.expand_hosts.detect_range
Micro-optimization: replace s.find(x)!=-1 with x in s

timeit shows a speedup of ~3x on Python 2.7.5 x86_64.
It also makes the code a bit shorter.
hostname module: don't filter hostnamectl with awk

There's no need to filter hostnamectl's output with awk because its man
page says:

    hostnamectl [OPTIONS...] {COMMAND}

       --static, --transient, --pretty
	   If status is used (or no explicit command is given) and one
	   of those fields is given, hostnamectl will print out just
           this selected hostname.

E.g. hostnamectl --static status => ansible.example.org