Move to python3

This commit moves configure.ac and python scripts to
python3

Signed-off-by: Santosh Puranik <santosh.puranik@in.ibm.com>
Change-Id: Iaa03dffe15903fbd68c354442823903cc3bb3ad2
diff --git a/configure.ac b/configure.ac
index 5895956..05bf92e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,9 +10,9 @@
 AM_PROG_AR
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
-AM_PATH_PYTHON([2.7],
+AM_PATH_PYTHON([3],
     [AC_SUBST([PYTHON], [echo "$PYTHON"])],
-    [AC_MSG_ERROR([Could not find python-2.7 installed...python-2.7 is required])])
+    [AC_MSG_ERROR([Could not find python-3 installed...python-3 is required])])
 
 PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus])
 PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging])