Updated version requirement for websockify

This patch updats the websockify version from 'websockify>=0.5.1,<0.6'
to 'websockify>=0.5.1,<0.7'.
websockify is required by nova. The newer version of websockify
has native support for the python 'logging` module.

blueprint: update-to-latest-websockify

Change-Id: I5030bd6d7f4c2326c9cf7c530f649e734322ab51
Updated an explanation to the sqla requirement

The comment was not relevant due to old versions mentioned.

Change-Id: I402b95157b506dc4e3c97a896d435f3b7bf09857
Add oslo.serialization to projects.txt

Change-Id: I9fe54837781774f9ac4262260bc4124ecc86c905
Merge "Updated an explanation to the sqla requirement"
Merge "Updated version requirement for websockify"
Add glance.store to global requirements

Glance store is a new library responsible of managing the interaction
between glance and the stores backing it. This is required for:
Iaacc70993ad5da292b93de42bbecda73d53b19fd

Change-Id: Ic87bd483a30a79d41b186cd353964aea029894d0
Merge "Add oslo.serialization to projects.txt"