Drop PRIORITY variable

As discussed on the mailing list, this variable isn't useful and if wanted
would be better implemented by distros using pn-X overrides.

This patch executes:

find . -regex ".*\.\(bb\|inc\)$" | xargs sed -i '/^PRIORITY = ".*"$/d'

against the tree removing the referenced. Thanks to Phil Blundell for
the command.

(From OE-Core rev: d122343362669c683acc4af295971a62cbc823fc)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python-imaging_1.1.7.bb

@@ -1,6 +1,5 @@
 DESCRIPTION = "Python Imaging Library"
 SECTION = "devel/python"
-PRIORITY = "optional"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://README;beginline=92;endline=120;md5=c4371af4579f1e489cf881c1443dd4ec"
 DEPENDS = "freetype jpeg tiff"

meta/recipes-devtools/python/python-pycurl_7.19.0.bb

@@ -1,7 +1,6 @@
 DESCRIPTION = "libcurl python bindings."
 HOMEPAGE = "http://pycurl.sourceforge.net/"
 SECTION = "devel/python"
-PRIORITY = "optional"
 LICENSE = "LGPLv2.1+ | MIT"
 LIC_FILES_CHKSUM = "file://README;endline=13;md5=fbfe545b1869617123a08c0983ef17b2 \
                     file://COPYING;md5=3579a9fd0221d49a237aaa33492f988c \

meta/recipes-devtools/python/python-pyrex_0.9.9.bb

@@ -2,7 +2,6 @@ DESCRIPTION = "Pyrex is a language specially designed for writing Python extensi
 It's designed to bridge the gap between the nice, high-level, easy-to-use world of Python \
 and the messy, low-level world of C."
 SECTION = "devel/python"
-PRIORITY = "optional"
 LICENSE = "Apache-2"
 LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=771d472f53f933033f57eeee7808e5bd"
 SRCNAME = "Pyrex"

meta/recipes-devtools/python/python-scons_2.0.1.bb

@@ -1,6 +1,5 @@
 DESCRIPTION = "A Software Construction Tool"
 SECTION = "devel/python"
-PRIORITY = "optional"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=8481211ebbeaed9cdc7ad5a3b0c98aaf"
 SRCNAME = "scons"

meta/recipes-devtools/python/python.inc

@@ -2,7 +2,6 @@ DESCRIPTION = "The Python Programming Language"
 HOMEPAGE = "http://www.python.org"
 LICENSE = "PSF"
 SECTION = "devel/python"
-PRIORITY = "optional"
 # bump this on every change in contrib/python/generate-manifest-2.6.py
 INC_PR = "nk2"