Revert "Temporarily add vcrpy!=2.0.0 as requirement for nose-detecthttp"

This reverts commit 53a3f20.

Reason for revert: The upstream issue has been resolved.[1]

[1]:
kevin1024/vcrpy#393

Bug: T205073
Change-Id: I3ed7635f9b8fed2252c4db8dce27e0d06dbe6cff

tox.ini

@@ -77,8 +77,6 @@ commands =
 deps =
     nose
     nose-detecthttp
-    # Temporary requirement. Should be fixed in vcrpy or required in nose-detecthttp.
-    vcrpy!=2.0.0
     unicodecsv
     mock
 
@@ -93,8 +91,6 @@ deps =
     beautifulsoup4
     nose
     nose-detecthttp>=0.1.3
-    # Temporary requirement. Should be fixed in vcrpy or required in nose-detecthttp.
-    vcrpy!=2.0.0
     six
     mock