bitbake: fetch2: fix import error for Python 3.6.5

When running bitbake command with Python 3.6.5 always result in
import error causing by the change of distutils module.
This patch replaces the method to search executable in PATH by
"/usr/bin/env <command>".

(Bitbake rev: 86a4cc7248afd3e561dc70f3490f45549265470a)

Signed-off-by: Tzu Hsiang Lin <t9360341@ntut.org.tw>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/clearcase.py

@@ -69,7 +69,6 @@ from   bb.fetch2 import FetchMethod
 from   bb.fetch2 import FetchError
 from   bb.fetch2 import runfetchcmd
 from   bb.fetch2 import logger
-from   distutils import spawn
 
 class ClearCase(FetchMethod):
     """Class to fetch urls via 'clearcase'"""
@@ -107,7 +106,7 @@ class ClearCase(FetchMethod):
         else:
             ud.module = ""
 
-        ud.basecmd = d.getVar("FETCHCMD_ccrc") or spawn.find_executable("cleartool") or spawn.find_executable("rcleartool")
+        ud.basecmd = d.getVar("FETCHCMD_ccrc") or "/usr/bin/env cleartool || rcleartool"
 
         if d.getVar("SRCREV") == "INVALID":
           raise FetchError("Set a valid SRCREV for the clearcase fetcher in your recipe, e.g. SRCREV = \"/main/LATEST\" or any other label of your choice.")

bitbake/lib/bb/fetch2/npm.py

@@ -32,7 +32,6 @@ from   bb.fetch2 import runfetchcmd
 from   bb.fetch2 import logger
 from   bb.fetch2 import UnpackError
 from   bb.fetch2 import ParameterError
-from   distutils import spawn
 
 def subprocess_setup():
     # Python installs a SIGPIPE handler by default. This is usually not what