Update instructions for custom image creation. a) Ubuntu xenial should be fine, b) different install of dib

DeployOpenStackHeat.md

@@ -33,7 +33,7 @@ To create an os-*-config ready Ubuntu image you could use the following commands
 
 ```
 sudo apt-get install python-pip
-sudo pip installl virtualenv
+sudo pip install virtualenv
 virtualenv ~/dib-virtualenv
 . ~/dib-virtualenv/bin/activate
 pip install diskimage-builder
@@ -41,9 +41,8 @@ mkdir custom-image
 cd custom-image
 git clone https://git.openstack.org/openstack/tripleo-image-elements.git
 git clone https://git.openstack.org/openstack/heat-templates.git
-git clone https://git.openstack.org/openstack/dib-utils.git
 export ELEMENTS_PATH=tripleo-image-elements/elements:heat-templates/hot/software-config/elements
-diskimage-builder/bin/disk-image-create vm ubuntu os-collect-config os-refresh-config os-apply-config heat-config heat-config-script -o ubuntu-$DIB_RELEASE-os-config.qcow2
+diskimage-builder/bin/disk-image-create vm ubuntu os-collect-config os-refresh-config os-apply-config heat-config heat-config-script -o ubuntu-xenial-os-config.qcow2
 ```
 As a remark (12-12-2016), you can see above that we use trusty (14.04) version of Ubuntu ($DIB_RELEASE). In principle, the heat template works with Ubuntu xenial (16.04), however we have problems connecting UEs to the core when using xenial. So please test with trusty (14.04) version of Ubuntu first.
 Update (4-10-2017) It should be safe to use ubuntu 16.04 xenial as far as read the mailinglist... I updated instructions accordingly.