Increase default logging for openstack services

Globals have logging override defined which is now different from
openstack services values in openstack-helm.

Openstack-helm addressed issue of missing logs related to warnings and
above for root logger which is catch-all logger when component specific
logger is not explictly defined.

OSH review: https://review.opendev.org/#/c/639711

Dropping logs in case of error or warnings can be problem for operators
in triaging an issue. We should not be hiding warning/error/critical logs
even when specific component logger is not defined as there can be cases
where each component is not defined in logging definition. See example
from OSH review.

In addition, is there a specific reason to have logging override for OS services
in airship side as they appear to be quite similar to defaults defined in
openstack-helm side. So may be we should revisit its need and address in
different patch if needed.

Change-Id: Iea24280546af1959d9da7164f0f18bf6a0a86e2d

global/software/charts/osh/openstack-cinder/cinder.yaml

@@ -236,7 +236,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_cinder:
           level: INFO
           handlers:

global/software/charts/osh/openstack-compute-kit/neutron.yaml

@@ -268,7 +268,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_neutron:
           level: INFO
           handlers:

global/software/charts/osh/openstack-compute-kit/nova.yaml

@@ -365,7 +365,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_nova:
           level: INFO
           handlers:

global/software/charts/osh/openstack-glance/glance.yaml

@@ -243,7 +243,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_glance:
           level: INFO
           handlers:

global/software/charts/osh/openstack-heat/heat.yaml

@@ -242,7 +242,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_heat:
           level: INFO
           handlers:

global/software/charts/osh/openstack-keystone/keystone.yaml

@@ -187,7 +187,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_keystone:
           level: INFO
           handlers:

global/software/charts/ucp/deckhand/barbican.yaml

@@ -172,7 +172,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_barbican:
           level: INFO
           handlers:

global/software/charts/ucp/keystone/keystone.yaml

@@ -154,7 +154,7 @@ data:
             - fluent
         logger_root:
           level: WARNING
-          handlers: 'null'
+          handlers: stdout
         logger_keystone:
           level: INFO
           handlers: