regression in unit tests - environment outdated since 3.9.2-45 rockst…

…or#1993

Adds previously omitted python imports and associated settings to
template file test-settings.conf.in. These same changes were
previously only applied to the non testing environment template file
settings.conf.in.

Fixes test_btrfs* runs.

conf/test-settings.conf.in

@@ -19,6 +19,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 # Django settings for Rockstor project.
 import os
+import subprocess, distro
 
 DEBUG = ${django-settings-conf:debug}
 TEMPLATE_DEBUG = DEBUG
@@ -384,4 +385,23 @@ UPDATE_CHANNELS = {
 		'description': 'Subscription channel for testing updates',
 		'url': 'rockstor.com/rockrepo-testing',
 		},
-}
+}
+
+# Setup OS specific command paths via 'which cmd' calls
+# N.B. this method will not work with an alias, ie in CentOS
+# which ls
+# alias ls='ls --color=auto'
+#         /usr/bin/ls
+# The following have been tested in CentOS, openSUSE Leap15, and Tumbleweed
+UDEVADM = subprocess.check_output(["which", "udevadm"]).rstrip()
+SHUTDOWN = subprocess.check_output(["which", "shutdown"]).rstrip()
+CHKCONFIG_BIN = subprocess.check_output(["which", "chkconfig"]).rstrip()
+
+# Establish our OS base id, name, and version:
+# Use id for code path decisions. Others are for Web-UI display purposes.
+# Examples given are for CentOS Rockstor variant, Leap 15, and Tumblweed.
+OS_DISTRO_ID = distro.id()  # rockstor, opensuse-leap, opensuse-tumbleweed
+OS_DISTRO_NAME = distro.name()  # Rockstor, openSUSE Leap, openSUSE Tumbleweed
+# Note that the following will capture the build os version.
+# For live updates (running system) we call distro.version() directly in code.
+OS_DISTRO_VERSION = distro.version()  # 3, 15.0 ,20181107