omitted case_insensitive flag from ftp meta

Author: willmcgugan

fs/base.py

@@ -537,6 +537,10 @@ def getmeta(self, namespace="standard"):
                             os.rename operation.
         =================== ============================================
 
+        Most builtin filesystems will provide all these keys, and third-
+        party filesystems should do so whenever possible. A key may not
+        be present if there is no way to know the value.
+
         .. note::
             Meta information is constant for the lifetime of the
             filesystem, and may be cached.

fs/ftpfs.py

@@ -279,7 +279,6 @@ class FTPFS(FS):
     """
 
     _meta = {
-        'case_insensitive': False,
         'invalid_path_chars': '\0',
         'network': True,
         'read_only': False,

fs/test.py

@@ -1747,9 +1747,12 @@ def test_unicode_path(self):
 
 
     def test_case_sensitive(self):
-        if self.fs.getmeta().get('case_insensitive', False):
-            self.skipTest('the filesystem is not case sensitive.')
+        meta = self.fs.getmeta()
+        if 'case_insensitive' not in meta:
+            self.skipTest('case sensitivity not known')
 
+        if meta.get('case_insensitive', False):
+            self.skipTest('the filesystem is not case sensitive.')
 
         self.fs.makedir('foo')
         self.fs.makedir('Foo')