Rename task to packagegroup

"Package group" is a much more appropriate name for these than task,
since we use the word task to describe units of work executed by
BitBake.

(From OE-Core rev: 424dcf7046e4ad09dcc664eb1992201195247fcf)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/packagegroups/packagegroup-core-sdk-gmae.bb

@@ -10,12 +10,12 @@ PR = "r12"
 
 ALLOW_EMPTY = "1"
 
-require task-sdk-gmae.inc
+require packagegroup-sdk-gmae.inc
 
 PACKAGES = "${PN}"
 
 RDEPENDS_${PN} = "\
-    task-core-sdk \
+    packagegroup-core-sdk \
     libglade-dev \
     ${SDK-GMAE} \
     ${SDK-EXTRAS}"

meta/recipes-gnome/packagegroups/packagegroup-core-standalone-gmae-sdk-target.bb

@@ -10,12 +10,12 @@ PR = "r14"
 
 ALLOW_EMPTY = "1"
 
-require task-sdk-gmae.inc
+require packagegroup-sdk-gmae.inc
 
 PACKAGES = "${PN} ${PN}-dbg"
 
 RDEPENDS_${PN} = "\
-    task-core-standalone-sdk-target \
+    packagegroup-core-standalone-sdk-target \
     libglade-dev \
     ${SDK-GMAE} \
     ${SDK-EXTRAS}"