Fix the following minor problems to reduce work after
stable/liberty branching:
1) RDO: Revert Python MySQL library from PyMySQL to MySQL-python
due to lack of support for the former.
2) RDO: Explicitly install 'ebtables' and 'ipset' packages due
to dependency problems.
3) General: Change numbered list to bulleted list for lists with
only one item.
4) General: Restructure horizon content to match other services.
More duplication of content, but sometimes RST conditionals
are terrible and distro packages should use the same
configuration files.
5) General: Restructure NoSQL content to match SQL content.
6) General: Improve clarity of NTP content.
Change-Id: I2620250aa27c7d41b525aa2646ad25e0692140c4
Closes-Bug: #1514760
Closes-Bug: #1514683
Implements: bp installguide-liberty
5ee72cfa36