meta/scripts: Various getVar/getVarFlag expansion parameter fixes

There were a few straggling expansion parameter removals left for
getVar/getVarFlag where the odd whitespace meant they were missed
on previous passes. There were also some plain broken ussages such
as:

d.getVar('ALTERNATIVE_TARGET', old_name, True)
path = d.getVar('PATH', d, True)
d.getVar('IMAGE_ROOTFS', 'True')

which I've corrected (they happend to work by luck).

(From OE-Core rev: 688f7a64917a5ce5cbe12f8e5da4d47e265d240f)

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

meta/classes/package.bbclass

@@ -1286,11 +1286,11 @@ python emit_pkgdata() {
             c = codecs.getencoder("unicode_escape")
             return c(str)[0].decode("latin1")
 
-        val = d.getVar('%s_%s' % (var, pkg), True)
+        val = d.getVar('%s_%s' % (var, pkg))
         if val:
             f.write('%s_%s: %s\n' % (var, pkg, encode(val)))
             return val
-        val = d.getVar('%s' % (var), True)
+        val = d.getVar('%s' % (var))
         if val:
             f.write('%s: %s\n' % (var, encode(val)))
         return val