From Trond.
Add basic nfsv4 support
The if (strncmp(opteq+1,"krb5",4)) masks later checks for krb5i and krb5p. Later checks have the same problem. We could reorder the checks, but I don't see any reason why the length is needed at all; with strcmp instead, we also catch mispellings like "krb5j" for "krb5i" which would otherwise be accepted without error.
Allow nfs versions 2 and 3 to mount with -osec=krb5.
The complete set of CITI NFSv4 patches combined into one jumbo patch.