Update Prereqs for the Denver Summit

Due to the shortened format of the Denver Summit we
need to make sure that the trainees do more work before the
summit than we normally have to.  This adds steps to the
page to get the trainees to do more setup before the Summit.
It also adds a number of warnings to the trainees about the
importance of preparing.

Finally, this includes a link to the new VM image for
the Denver Summit.

Change-Id: I3ad612450b24d15d1d9d308f22c49c22f742d9d6

doc/upstream-training/source/website/index.rst

@@ -78,6 +78,10 @@ and registration.
 |            |Denver    |         |         |                                |
 +------------+----------+---------+---------+--------------------------------+
 
+.. note::
+   For the Denver Summit training it is **essential that all trainees complete
+   the prequisite steps** in the ``For Trainees`` section below.
+
 For Trainees
 ============
 Prerequisite and best practice guide for trainees:

doc/upstream-training/source/website/upstream-trainees-guide.rst

@@ -11,9 +11,9 @@ How to prepare
 * Download the prepared virtual machine image and some environment
   for running the image (We suggest VirtualBox):
 
-  * Image: http://bit.ly/vm-2018-berlin-v1
+  * Image: http://bit.ly/vm-2019-denver-v1
 
-* Optional: Prepare an environment by yourself from scratch:
+* Prepare an environment by yourself from scratch:
 
   * Create a virtual machine on your laptop with Ubuntu 16.04 installed and
     6+ GB of RAM.
@@ -24,6 +24,32 @@ How to prepare
     `Setup IRC <https://docs.openstack.org/contributors/common/irc.html>`_
     guide.
 
+* Go to the `Account Setup
+  <https://docs.openstack.org/contributors/common/accounts.html>`_
+  page and complete the steps documented there to setup your OpenStack
+  Foundation Account and accounts for accessing OpenStack's bug and task
+  tracking systems.
+* Prepare git in the virtual machine that was created above:
+
+  * Complete the ``Configure Git`` steps documented on the
+    `Setup and Learn GIT
+    <https://docs.openstack.org/contributors/common/git.html>`_
+    page.  If you are not familiar with Git you may want to also read the
+    content under the ``Learning Git`` section.
+  * Go to the `Setting Up Your Gerrit Account
+    <https://docs.openstack.org/contributors/common/setup-gerrit.html>`_
+    page and follow the steps for ``Sign Up``,
+    ``Individual Contributor License Agreement``,
+    and optionally, the ``Setup SSH Keys``.
+
 .. note::
-   Aside from the Setup IRC section above, we will cover everything else that is in
+   Aside from the sections above, we will cover everything else that is in
    `the Contributor Guide <https://docs.openstack.org/contributors/>`_ during the class.
+
+.. note::
+   If you are attempting the steps above in the week before the OpenStack
+   Upstream Institute class and need assistance you can find mentors in the
+   #openstack-upstream-institute channel on irc.freenode.net.
+
+   There will also be office hours from 4 to 6 pm at the Former Saint
+   Craft Kitchen and Taps in the Hyatt on Saturday, April 27th, 2019.

doc/upstream-training/source/website/upstream-training-summit.rst

@@ -13,3 +13,17 @@ April with a full training running prior to the event.
 
 Make sure you `RSVP <https://www.openstack.org/summit/denver-2019/summit-schedule/events/23607/openstack-upstream-institute-sponsored-by-lenovo-rsvp-required>`_!
 
+.. warning::
+   The OpenStack Upstream Institute session in Denver is going to be
+   shortened from its normal one-and-a-half day length to a single day.
+   As a result it will be essential for all attendees to complete the
+   preparation steps in the `OpenStack Upstream Institute Trainees' Guide
+   <https://docs.openstack.org/upstream-training/upstream-trainees-guide.html>`_
+
+.. note::
+   If you are attempting the steps above in the week before the OpenStack
+   Upstream Institute class and need assistance you can find mentors in the
+   #openstack-upstream-institute channel on irc.freenode.net.
+
+   There will also be office hours from 4 to 6 pm at the Former Saint
+   Craft Kitchen and Taps in the Hyatt on Saturday, April 27th, 2019.