Add option to TFTP client to ignore ':' in file name

I have encountered a situation where I would like to use tftp-hpa to
retrieve a file that resides within an absolute path containing a ':'
character.  Ala, "tftp foobar -c get C:2/tftpdir/myfile".  Since the
tftp client automatically converts the host:file syntax, I get an
error "tftp: C: Unknown host".

I made a chage to the tftp client code to add a literal mode (-l),
that prevents the special treatment of the ':' character.  I've
attached a patch set for main.c and tftp.1.in for your consideration.
I'm not sure how many folks run into this, but it may be somewhat
common for VxWorks and perhaps MSDOS users.

Thanks,
Craig Johnston

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