unit-test: Run all of phosphor-logging's tests

Also run phosphor-logging's PEL extension unit tests to get better
coverage.

Change-Id: I50799a6ed74397bb471ca2107b2f210ec3f3f5dd
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/scripts/unit-test.py b/scripts/unit-test.py
index c0e80a8..a3ce157 100755
--- a/scripts/unit-test.py
+++ b/scripts/unit-test.py
@@ -735,7 +735,7 @@
     CONFIGURE_FLAGS = {
         'sdbusplus': ['--enable-transaction'],
         'phosphor-logging':
-        ['--enable-metadata-processing',
+        ['--enable-metadata-processing', '--enable-openpower-pel-extension',
          'YAML_DIR=/usr/local/share/phosphor-dbus-yaml/yaml']
     }