Accepte tilda as a character for a cloud name

Refs: #4126

kamaki/cli/config.py

@@ -48,7 +48,7 @@ except ImportError:
 
 
 class InvalidCloudNameError(Error):
-    """A valid cloud name is accepted by this regex: ([@#$:-\w]+)"""
+    """A valid cloud name is accepted by this regex: ([~@#$:-\w]+)"""
 
 
 log = getLogger(__name__)
@@ -135,7 +135,7 @@ class Config(RawConfigParser):
     def _cloud_name(full_section_name):
         if not full_section_name.startswith(CLOUD_PREFIX + ' '):
             return None
-        matcher = match(CLOUD_PREFIX + ' "([@#$:\-\w]+)"', full_section_name)
+        matcher = match(CLOUD_PREFIX + ' "([~@#$:\-\w]+)"', full_section_name)
         if matcher:
             return matcher.groups()[0]
         else: