Add install_repoquery parameter to the yum module
Update docstring for rhn details
Fix up docstring type and extra info about list
Fix typo
Install yum-utils by default
remove install_repoquery docstring
add failsafe comment for install_repoquery
Trim pipelining docs a bit.
Document vault and make some cross-references in places where people should read about vault.
Add vault documentation.
Merge pull request #6208 from jctanner/yum-rhn-fix

Fixes #6205 Add install_repoquery parameter to the yum module
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