base: Use repr() for printing exceptions

Exceptions print more clearly using repr() instead of str(), fix
in fetch and unpack tasks.

Drop part of the test which no longer makes sense after this change.

(From OE-Core rev: 045124ce7ef7c53a1932848835f93abbe535f157)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit c94816259cc1c09746353ad26ca0c811e0c962c2)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/base.bbclass

@@ -160,7 +160,7 @@ python base_do_fetch() {
         fetcher = bb.fetch2.Fetch(src_uri, d)
         fetcher.download()
     except bb.fetch2.BBFetchException as e:
-        bb.fatal(str(e))
+        bb.fatal("Bitbake Fetcher Error: " + repr(e))
 }
 
 addtask unpack after do_fetch
@@ -177,7 +177,7 @@ python base_do_unpack() {
         fetcher = bb.fetch2.Fetch(src_uri, d)
         fetcher.unpack(d.getVar('WORKDIR'))
     except bb.fetch2.BBFetchException as e:
-        bb.fatal(str(e))
+        bb.fatal("Bitbake Fetcher Error: " + repr(e))
 }
 
 def get_layers_branch_rev(d):

meta/lib/oeqa/selftest/cases/bbtests.py

@@ -148,9 +148,6 @@ INHERIT_remove = \"report-error\"
         self.delete_recipeinc('man-db')
         self.assertEqual(result.status, 1, msg="Command succeded when it should have failed. bitbake output: %s" % result.output)
         self.assertIn('Fetcher failure: Unable to find file file://invalid anywhere. The paths that were searched were:', result.output)
-        line = self.getline(result, 'Fetcher failure for URL: \'file://invalid\'. Unable to fetch URL from any source.')
-        self.assertTrue(line and line.startswith("ERROR:"), msg = "\"invalid\" file \
-doesn't exist, yet fetcher didn't report any error. bitbake output: %s" % result.output)
 
     def test_rename_downloaded_file(self):
         # TODO unique dldir instead of using cleanall