* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:
```bash
logrotate-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
./logrotate/osmap.yaml
1:1 warning missing document start "---" (document-start)
./logrotate/osfamilymap.yaml
1:1 warning missing document start "---" (document-start)
7:15 warning truthy value should be one of [false, true] (truthy)
12:14 warning truthy value should be one of [false, true] (truthy)
14:23 warning truthy value should be one of [false, true] (truthy)
16:14 warning truthy value should be one of [false, true] (truthy)
24:14 warning truthy value should be one of [false, true] (truthy)
./logrotate/defaults.yaml
4:1 warning missing document start "---" (document-start)
11:23 warning truthy value should be one of [false, true] (truthy)
13:13 warning truthy value should be one of [false, true] (truthy)
15:13 warning truthy value should be one of [false, true] (truthy)
16:1 error too many blank lines (1 > 0) (empty-lines)
pillar.example
3:1 warning missing document start "---" (document-start)
5:4 warning missing starting space in comment (comments)
6:6 warning missing starting space in comment (comments)
6:5 warning comment not indented like content (comments-indentation)
7:6 warning missing starting space in comment (comments)
9:13 warning truthy value should be one of [false, true] (truthy)
11:13 warning truthy value should be one of [false, true] (truthy)
12:15 warning truthy value should be one of [false, true] (truthy)
13:14 warning truthy value should be one of [false, true] (truthy)
26:12 error trailing spaces (trailing-spaces)
48:12 error too many spaces after hyphen (hyphens)
69:1 error too many blank lines (1 > 0) (empty-lines)
```
The iteritems dictionary method has been removed in Python 3 and using
items() is typically no problem in our case due to the fact that
dictionaries are rather small.
This fixes#15
