Merge branch 'feature/py23_kconfig_new' into 'master'

tools: Make kconfig_new Python3-compatible and enable Python3 in idf.py

See merge request idf/esp-idf!3304

tools/kconfig_new/gen_kconfig_doc.py

@@ -20,6 +20,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from __future__ import print_function
 import os
 import re
 import kconfiglib