[confcom] Make the to-be-released version 2.0.0b1 instead of an actual 2.0.0

Suggested-by: Ken Gordon <kegordo@microsoft.com>

Author: micromaomao

src/confcom/HISTORY.rst

@@ -3,7 +3,7 @@
 Release History
 ===============
 
-2.0.0
+2.0.0b1
 +++++
 * Add Windows container support with CIM-based layer hashing
 * Support for mounted_cim field in security policies for Windows containers

src/confcom/azext_confcom/azext_metadata.json

@@ -1,3 +1,4 @@
 {
-    "azext.minCliCoreVersion": "2.26.2"
-}
+    "azext.minCliCoreVersion": "2.26.2",
+    "azext.isPreview": true
+}

src/confcom/setup.py

@@ -19,7 +19,7 @@
 
     logger.warn("Wheel is not available, disabling bdist_wheel hook")
 
-VERSION = "2.0.0"
+VERSION = "2.0.0b1"
 
 # The full list of classifiers is available at
 # https://pypi.python.org/pypi?%3Aaction=list_classifiers