Resolve "User Sync Tool - Step 1 - read and write custom schema, and initiate scanning"

• Read customSchema
• Build list of uids that need to be scanned
• Limit and Cap changes
• Set 'scan' for these uids
• Also, clear customSchema for reactivated (unsuspended) uids

Added a --cache-dir option (see README.md) so I could run multiple times and not have to wait for 70k+ users to be pulled from lookup and google every time. Bit of a cludge with decorator.

May be easier to review one commit at a time

Closes #40 (closed)

gsuitesync/sync/gapi.py

@@ -13,7 +13,7 @@ import socket
 from .base import ConfigurationStateConsumer
 from .. import gapiutil
 from .utils import (email_to_uid, email_to_gid, groupID_regex, instID_regex,
-                    date_months_ago, isodate_parse, customAction, cache_to_disk)
+                    date_months_ago, isodate_parse, custom_action, cache_to_disk)
 
 
 LOG = logging.getLogger(__name__)
@@ -135,8 +135,8 @@ class GAPIRetriever(ConfigurationStateConsumer):
         # Form a set of suspended uids that have no mydrive-shared-action or -result
         no_mydrive_shared_settings_uids = {
             uid for uid, u in all_google_users_by_uid.items()
-            if u['suspended'] and not customAction(u, 'mydrive-shared-action') and
-            not customAction(u, 'mydrive-shared-result')
+            if u['suspended'] and not custom_action(u, 'mydrive-shared-action') and
+            not custom_action(u, 'mydrive-shared-result')
         }
 
         # Sanity check. We should not have lost anything. (I.e. the uids should be unique.)