imports: import from hgext instead of hgext3rd

The only reason these worked is because they were in the system python path.
Which means the in-repo code wasn't actually being tested.

hgext/fastlog.py

@@ -44,7 +44,7 @@ def extsetup(ui):
     try:
         conduit = extensions.find("fbconduit")
     except KeyError:
-        from hgext3rd import fbconduit as conduit
+        from hgext import fbconduit as conduit
     except ImportError:
         ui.warn(_('Unable to find fbconduit extension\n'))
         return

hgext/fastpartialmatch.py

@@ -43,7 +43,7 @@ rev numbers for nodes should be correct too.
 
 from collections import defaultdict
 from functools import partial
-from hgext3rd.generic_bisect import bisect
+from hgext.generic_bisect import bisect
 
 from mercurial import (
     changelog,

hgext/fbamend/hiddenoverride.py

@@ -7,7 +7,7 @@
 
 from __future__ import absolute_import
 
-from hgext3rd import extutil
+from hgext import extutil
 
 from mercurial.node import short
 from mercurial import (

hgext/rage.py

@@ -20,7 +20,7 @@ from mercurial import (
 )
 from mercurial import pycompat, scmutil
 from hgext import blackbox
-from hgext3rd import (
+from hgext import (
     shareutil,
     smartlog,
     fbsparse as sparse,

hgext/remotefilelog/debugcommands.py

@@ -9,7 +9,7 @@ from __future__ import absolute_import
 from mercurial import error, filelog, revlog
 from mercurial.node import bin, hex, nullid, short
 from mercurial.i18n import _
-from hgext3rd import extutil
+from hgext import extutil
 from . import (
     constants,
     datapack,

hgext/remotefilelog/remotefilectx.py

@@ -22,7 +22,7 @@ def createconduit(ui):
         conduit = extensions.find("fbconduit")
     except KeyError:
         try:
-            from hgext3rd import fbconduit as conduit
+            from hgext import fbconduit as conduit
         except ImportError:
             ui.log('linkrevfixup',
                    _('unable to find fbconduit extension\n'))

hgext/remotefilelog/repack.py

@@ -1,7 +1,7 @@
 from __future__ import absolute_import
 
 import os
-from hgext3rd.extutil import runshellcommand, flock
+from hgext.extutil import runshellcommand, flock
 from mercurial import (
     encoding,
     error,

hgext/remotefilelog/shallowrepo.py

@@ -6,7 +6,7 @@
 # GNU General Public License version 2 or any later version.
 from __future__ import absolute_import
 
-from hgext3rd.extutil import runshellcommand
+from hgext.extutil import runshellcommand
 from mercurial.i18n import _
 from mercurial.node import hex, nullid, nullrev
 from mercurial import encoding, error, localrepo, util, match, scmutil

hgext/undo.py

@@ -42,7 +42,7 @@ from mercurial.node import (
     nullid,
 )
 
-from hgext3rd import (
+from hgext import (
     interactiveui,
 )