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: I54b2d7d84bdd651fb96a62b3af3244c6ab484059

doc/source/user/howto.rst

@@ -15,7 +15,7 @@ environment variables:
 For your ease of use, ``env-vars`` can be sourced to allow the CLI to connect
 to a local ironic installation operating in noauth mode. Run e.g.::
 
-  source env-vars
+  . env-vars
   ironic node-list
   +------+------+---------------+-------------+--------------------+-------------+
   | UUID | Name | Instance UUID | Power State | Provisioning State | Maintenance |

scripts/env-setup.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eu
 
-source $(dirname $0)/install-deps.sh
+. $(dirname $0)/install-deps.sh
 # NOTE(pas-ha) the above exports some useful variables like
 # $PYTHON , $PIP and $VENV depending on venv install or not
 

scripts/install-deps.sh

@@ -129,7 +129,7 @@ if [ -n "${VENV-}" ]; then
     # Note(cinerama): activate is not compatible with "set -u";
     # disable it just for this line.
     set +u
-    source ${VENV}/bin/activate
+    . ${VENV}/bin/activate
     set -u
     VIRTUAL_ENV=${VENV}
 else