Support file specification in a dataset starting with './' and '../' in addition to '/'. Update man pages to indicate it is general and not just fo KeyTable*.

dkimpy_milter/config.py

@@ -278,7 +278,7 @@ def _dataset_to_list(dataset):
             # This is a flat file dataset, which are key value:value stores
             ds = []
             dsd = {}
-            if dataset[0] == '/':
+            if dataset[0] == '/' or dataset[:2] == './' or dataset[:3] == '../':
                 dsname = dataset
             elif dataset[:5] == 'file:':
                 dsname = dataset[5:]

dkimpy_milter/util.py

@@ -175,7 +175,7 @@ def read_keytable(tabledict, milterconfig):
     import dkim
     import syslog
     for dictkey, values in tabledict.items():
-        if values[-1][:1] == '/':
+        if values[-1][:1] == '/' or values[-1][:2] == './' or values[-1][:3] == '../':
             key = read_keyfile(values[-1], milterconfig)
         tabledict[dictkey] = [values[0], values[1], key]
     return tabledict

man/dkimpy-milter.8

@@ -182,7 +182,10 @@ should be separated by colons.
 .TP
 .I i)
 If the string contains none of these prefixes but starts with a slash ("/")
-character, it is presumed to be a flat file as described above.
+character, or "./" or "../", it is presumed to be a flat file as described
+above. Note: In OpenDKIM "./" and "../" only apply to KeyTable, but for
+dkimpy-milter it is generally applicable and KeyTable specification is not
+a special case.
 .TP
 .I j)
 If the string begins with "csl:", the string is treated as a comma-separated