namever: Treat rfcXXX as non-version

This fixes version detection for strict_rfc3339-0.7-py2.7.egg :

    def test_namever(url, nameok, verok):
>       assert nxdbom.namever(url) == (nameok, verok)
E       AssertionError: assert ('strict', 'rfc3339-0.7') == ('strict_rfc3339', '0.7')
E         At index 0 diff: 'strict' != 'strict_rfc3339'
E         Full diff:
E         - ('strict_rfc3339', '0.7')
E         ?         ^       ^^^^
E         + ('strict', 'rfc3339-0.7')
E         ?         ^^^^       ^

nxdbom/__init__.py

@@ -358,6 +358,8 @@ def _namever(url, failonerr):
         isver = 'patch' in v            or \
                 'slapospatched' in v    or \
                 v_ndigit > (len(v)-1) / 3
+        if 'rfc' in v:  # ex strict_rfc3339-0.7
+            isver = False
         if not isver:   # doesn't look like a version
             break
         name = name[:m.start()]

nxdbom/nxdbom_test.py

@@ -47,6 +47,7 @@ from os.path import dirname, exists
     ('http://snowball.tartarus.org/dist/libstemmer_c.tgz',  'libstemmer_c', None),
     ('https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.0-patch1/src/hdf5-1.10.0-patch1.tar.bz2',  'hdf5', '1.10.0-patch1'),
     ('http://ftp.debian.org/debian/pool/main/f/findutils/findutils_4.8.0.orig.tar.xz', 'findutils', '4.8.0'),
+    ('strict_rfc3339-0.7-py2.7.egg',  'strict_rfc3339', '0.7'),
 ])
 def test_namever(url, nameok, verok):
     assert nxdbom.namever(url) == (nameok, verok)