Remove trailing whitespace.
Fix broken Ansible Tower link.
Update intro_installation.rst

error in ubuntu install instructions
Merge pull request #6281 from alimony/fix_broken_tower_link

Fix broken Ansible Tower link.
Merge pull request #6282 from koffu/patch-1

Update intro_installation.rst
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