Drop doctest, as we aren't utilizing it

We should add back in some proper unit testing.  Doctest is rather limited,
and we haven't actually made use of it since the original implementation of
the datastore when the project started, as far as I'm aware.

(Bitbake rev: 3a11c2807972bbbddffde2fa67fc380d159da467)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/utils.py

@@ -97,14 +97,7 @@ _package_ends_    = ["pre", "p", "alpha", "beta", "rc", "cvs", "bk", "HEAD" ]
 
 def relparse(myver):
     """Parses the last elements of a version number into a triplet, that can
-    later be compared:
-
-    >>> relparse('1.2_pre3')
-    [1.2, -2, 3.0]
-    >>> relparse('1.2b')
-    [1.2, 98, 0]
-    >>> relparse('1.2')
-    [1.2, 0, 0]
+    later be compared.
     """
 
     number   = 0
@@ -150,17 +143,6 @@ __vercmp_cache__ = {}
 def vercmp_string(val1,val2):
     """This takes two version strings and returns an integer to tell you whether
     the versions are the same, val1>val2 or val2>val1.
-
-    >>> vercmp('1', '2')
-    -1.0
-    >>> vercmp('2', '1')
-    1.0
-    >>> vercmp('1', '1.0')
-    0
-    >>> vercmp('1', '1.1')
-    -1.0
-    >>> vercmp('1.1', '1_p2')
-    1.0
     """
 
     # quick short-circuit