convert bcopy calls to memcpy

[carns]

IRC report that openSUSE 10.3 came with a broken bcopy() implementation for some architectures:

https://bugzilla.novell.com/show_bug.cgi?id=328486

There are three remaining uses of bcopy() within PVFS. One of them happens to be for socket setup. The result is that all PVFS network connections are made to localhost.

We can just convert our bcopy() calls to memcpy() to make sure that we don't hit this particular problem. bcopy() is being deprecated in POSIX anyway.

[carns]

converted all occurrences of bcopy to memcpy and propagated to appropriate branches.