Changed as per the standard convention set to use "."

When we have to source a script file use . instead of source
For Reference follow below link:
https://docs.openstack.org/contributor-guide/writing-style/code-conventions

Change-Id: Icc6a692d37e8a5bc1146d803c873505cbf6cd03f

docker/gnocchi/gnocchi-api/extend_start.sh

@@ -4,7 +4,7 @@
 # results in the container not being able to restart. (bug #1489676, 1557036)
 if [[ "${KOLLA_BASE_DISTRO}" =~ debian|ubuntu ]]; then
     # Loading Apache2 ENV variables
-    source /etc/apache2/envvars
+    . /etc/apache2/envvars
     rm -rf /var/run/apache2/*
 else
     rm -rf /var/run/httpd/* /run/httpd/* /tmp/httpd*

docker/nova/nova-placement-api/extend_start.sh

@@ -4,7 +4,7 @@
 # results in the container not being able to restart. (bug #1489676, 1557036)
 if [[ "${KOLLA_BASE_DISTRO}" =~ debian|ubuntu ]]; then
     # Loading Apache2 ENV variables
-    source /etc/apache2/envvars
+    . /etc/apache2/envvars
     rm -rf /var/run/apache2/*
 else
     rm -rf /var/run/httpd/* /run/httpd/* /tmp/httpd*

docker/panko/panko-api/extend_start.sh

@@ -4,7 +4,7 @@
 # results in the container not being able to restart. (bug #1489676, 1557036)
 if [[ "${KOLLA_BASE_DISTRO}" =~ debian|ubuntu ]]; then
     # Loading Apache2 ENV variables
-    source /etc/apache2/envvars
+    . /etc/apache2/envvars
     rm -rf /var/run/apache2/*
 else
     rm -rf /var/run/httpd/* /run/httpd/* /tmp/httpd*

tools/setup_Debian.sh

@@ -35,7 +35,7 @@ function setup_disk {
 # (SamYaple)TODO: Remove the path overriding
 export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 
-source /etc/lsb-release
+. /etc/lsb-release
 
 # Setup Docker repo and add signing key
 sudo apt-get update

tools/setup_gate.sh

@@ -6,8 +6,8 @@ set -o errexit
 # Enable unbuffered output for Ansible in Jenkins.
 export PYTHONUNBUFFERED=1
 
-source /etc/nodepool/provider
-source /etc/ci/mirror_info.sh
+. /etc/nodepool/provider
+. /etc/ci/mirror_info.sh
 
 # Just for mandre :)
 if [[ ! -f /etc/sudoers.d/jenkins ]]; then