NetUtils / StringUtils / Tokenizer

[Joerg Heinicke]

After Cheche's bug report I had a look at NetUtils. Though Ugo fixed it 
with a quick fix, it does not really solve the problem as a test with 
the updated NetUtilsTestCase and the NetUtils before my latest commit 
can easily show.

My problem is that there are many problems in different places in the code:

1. o.a.commons.lang.StringUtils.split() behaves strange in that way that 
o.a.com.l.SU.split("", "/") return an empty String[]
while
o.a.coc.u.SU.split("", "/") returns String[] {""} which is what I would 
expect.
Also
o.a.com.l.SU.split("/", "/") returns empty String[].
This means the iteration over the string array can never really work 
with o.a.commons.lang.StringUtils.

=> reverted that change.

2. our Tokenizer behaves strange in one case:

o.a.coc.u.SU.split("/", "/")
=> new Tokenizer("/", "/", false)
=> tokenizer.countTokens() = 2
=> but tokenizer.hasMoreTokens() returns true only once
=> leads to String[] {"", null} while it should be String[] {"", ""}
3. while the Tokenizer correctly works on "/../" the 
NetUtils.normalize() method has a problem with it:

result of split/tokenize: String[] {"", "..", ""}
result of normalize(): ""
Joerg