lib/oeqa/utils/commands.py: Move updateEnv() from runexported.py

updateEnv() can be used in other places so move the
function to utils/commands.py

(From OE-Core rev: 380e5d80898cac4ffc9715b3f597d0b62a0643ff)

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/commands.py

@@ -261,3 +261,15 @@ def runqemu(pn, ssh=True):
             qemu.stop()
         except:
             pass
+
+def updateEnv(env_file):
+    """
+    Source a file and update environment.
+    """
+
+    cmd = ". %s; env -0" % env_file
+    result = runCmd(cmd)
+
+    for line in result.output.split("\0"):
+        (key, _, value) = line.partition("=")
+        os.environ[key] = value