Fixed an issue when configuration file options partly ignored when `--project-conf` // Resolve #3034 (#3055)

* Fixed an issue when configuration file options partly ignored when using custom ``--project-conf`` // Resolve #3034

* Py2 compatible makedirs

* Fix circle dependency

* Fix broken import in test examples

* Fix history

* Remove YAPF markers

* PyLint fix

* Fix invalid project conf path

* Move PIO Core to the root on Windows, issue with long CPPPATHs

* Respect global PLATFORMIO_BUILD_CACHE_DIR env var

* Fix Appveyor paths

* Minor changes

platformio/util.py

@@ -191,7 +191,7 @@ def get_logical_devices():
 
 def get_mdns_services():
     try:
-        import zeroconf
+        import zeroconf  # pylint: disable=import-outside-toplevel
     except ImportError:
         from site import addsitedir
         from platformio.managers.core import get_core_package_dir
@@ -199,7 +199,7 @@ def get_mdns_services():
         contrib_pysite_dir = get_core_package_dir("contrib-pysite")
         addsitedir(contrib_pysite_dir)
         sys.path.insert(0, contrib_pysite_dir)
-        import zeroconf
+        import zeroconf  # pylint: disable=import-outside-toplevel
 
     class mDNSListener(object):
         def __init__(self):
@@ -360,7 +360,7 @@ def get_api_result(url, params=None, data=None, auth=None, cache_valid=None):
             time.sleep(2 * total)
 
     raise exception.APIRequestError(
-        "Could not connect to PlatformIO API Service. " "Please try later."
+        "Could not connect to PlatformIO API Service. Please try later."
     )