logging: virtual refactoring

Remove the phosphor-logging virtuals.  They were unused.

Add a logging packagegroup so other layers can add additional
logging applications predicated on the logging distro feature
being enabled.

Change-Id: Ic82843cb2b1229df55005bad93576c14f468073b
Tested: Built witherspoon, palmetto and qemu images
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/classes/obmc-phosphor-image.bbclass b/meta-phosphor/classes/obmc-phosphor-image.bbclass
index 1a51614..ab72deb 100644
--- a/meta-phosphor/classes/obmc-phosphor-image.bbclass
+++ b/meta-phosphor/classes/obmc-phosphor-image.bbclass
@@ -36,7 +36,7 @@
 FEATURE_PACKAGES_obmc-host-state-mgmt ?= "packagegroup-obmc-apps-host-state-mgmt"
 FEATURE_PACKAGES_obmc-inventory ?= "packagegroup-obmc-apps-inventory"
 FEATURE_PACKAGES_obmc-leds ?= "packagegroup-obmc-apps-leds"
-FEATURE_PACKAGES_obmc-logging-mgmt ?= "${@df_enabled(d, 'obmc-logging-mgmt', 'virtual-obmc-logging-mgmt')}"
+FEATURE_PACKAGES_obmc-logging-mgmt ?= "${@df_enabled(d, 'obmc-logging-mgmt', 'packagegroup-obmc-apps-logging')}"
 FEATURE_PACKAGES_obmc-net-ipmi ?= "${@df_enabled(d, 'obmc-net-ipmi', 'virtual-obmc-net-ipmi')}"
 FEATURE_PACKAGES_obmc-sensors ?= "packagegroup-obmc-apps-sensors"
 FEATURE_PACKAGES_obmc-software ?= "packagegroup-obmc-apps-software"