license.bbclass: Use bb.fatal() instead of raising FuncFailed

This sets a good example and avoids unnecessarily contributing to
perceived complexity and cargo culting.

Motivating quote below:

< kergoth> the *original* intent was for the function/task to error via
           whatever appropriate means, bb.fatal, whatever, and
           funcfailed was what you'd catch if you were calling
           exec_func/exec_task. that is, it's what those functions
           raise, not what metadata functions should be raising
< kergoth> it didn't end up being used that way
< kergoth> but there's really never a reason to raise it yourself

FuncFailed.__init__ takes a 'name' argument rather than a 'msg'
argument, which also shows that the original purpose got lost.

(From OE-Core rev: 8e9255763674703ea16651da64fe794e5359f16e)

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/license.bbclass

@@ -465,7 +465,7 @@ def find_license_files(d):
             pass
 
     if not generic_directory:
-        raise bb.build.FuncFailed("COMMON_LICENSE_DIR is unset. Please set this in your distro config")
+        bb.fatal("COMMON_LICENSE_DIR is unset. Please set this in your distro config")
 
     if not lic_files:
         # No recipe should have an invalid license file. This is checked else
@@ -477,7 +477,7 @@ def find_license_files(d):
         try:
             (type, host, path, user, pswd, parm) = bb.fetch.decodeurl(url)
         except bb.fetch.MalformedUrl:
-            raise bb.build.FuncFailed("%s: LIC_FILES_CHKSUM contains an invalid URL:  %s" % (d.getVar('PF', True), url))
+            bb.fatal("%s: LIC_FILES_CHKSUM contains an invalid URL:  %s" % (d.getVar('PF', True), url))
         # We want the license filename and path
         chksum = parm['md5'] if 'md5' in parm else parm['sha256']
         lic_chksums[path] = chksum