Fix to use "." to source script files

Adhering to coding conventions. Refer to ``Code conventions`` at
https://docs.openstack.org/contributor-guide/ for details.

Change-Id: I6d217c259cb6cd0e8413e50b6722fc4d0478ea1b

doc/source/quickstart_docker.rst

@@ -63,7 +63,7 @@ Now that the RC file is available from the container, you can run any OpenStack
 .. code-block:: bash
 
     sudo docker run --rm -it -v $PWD:/tmp/vmtp berrypatch/vmtp bash
-    root@af7cedc3866f:/# source /tmp/vmtp/admin-openrc.sh
+    root@af7cedc3866f:/# . /tmp/vmtp/admin-openrc.sh
 
 
 4.1. Verify flavor names

doc/source/quickstart_git.rst

@@ -18,7 +18,7 @@ Installation on Ubuntu/Debian
     $ sudo apt-get install libxml2-dev libxslt-dev libffi-dev libz-dev libyaml-dev libssl-dev
     $ # create a virtual environment
     $ virtualenv ./vmtpenv
-    $ source ./vmtpenv/bin/activate
+    $ . ./vmtpenv/bin/activate
     $ git clone git://git.openstack.org/openstack/vmtp
     $ cd vmtp
     $ pip install -r requirements-dev.txt
@@ -35,7 +35,7 @@ Installation on RHEL/CentOS
     $ sudo pip install git-review
     $ # create a virtual environment
     $ virtualenv ./vmtpenv
-    $ source ./vmtpenv/bin/activate
+    $ . ./vmtpenv/bin/activate
     $ git clone git://git.openstack.org/openstack/vmtp
     $ cd vmtp
     $ pip install -r requirements-dev.txt
@@ -60,7 +60,7 @@ First, download XCode from App Store, then execute below commands:
     $ sudo pip install virtualenv
     $ # create a virtual environment
     $ virtualenv ./vmtpenv
-    $ source ./vmtpenv/bin/activate
+    $ . ./vmtpenv/bin/activate
     $ git clone git://git.openstack.org/openstack/vmtp
     $ cd vmtp
     $ pip install -r requirements-dev.txt
@@ -100,7 +100,7 @@ In the VMTP virtual environment, you can run any OpenStack CLI command (since th
 
 .. code-block:: bash
 
-    source admin-openrc.sh
+    . admin-openrc.sh
 
 
 4.1. Verify flavor names

doc/source/quickstart_pip.rst

@@ -46,7 +46,7 @@ Create a virtual environment for Python, and install VMTP:
 .. code-block:: bash
 
     $ virtualenv ./vmtpenv
-    $ source ./vmtpenv/bin/activate
+    $ . ./vmtpenv/bin/activate
     $ pip install vmtp
     $ vmtp -h