Move unix sockets into /tmp.

[yarlB]

Suggestion:
3 tests failed in my environment because rump server init failed: File name too long.
Actually, the limit for a unix socket's path length is quite small.
For example on NetBSD, according to unix(4) man page:

UNIX-domain addresses are variable-length filesystem pathnames of at most 104 characters.

while /usr/include/ufs/ffs/fs.h

#define MAXMNTLEN 468

Can we put sockets in /tmp?
Or maybe it is kind of odd to patch this because I work in paths far from /

[anttikantee]

The reason they're in cwd is so that they don't conflict with other ongoing tests on the name host. So, at least use $$ and apply a cleanup trap if you want to move them to /tmp. rump_server (well, strictly speaking the hypercall portion of the remove syscall support) attempts to cleanup sockets when the rump kernel halts, but that of course doesn't work in case of a crash. Hence, the test script would be responsible for cleanup in "global" paths.

Also, pullup is gated on passing travis (even if the change itself didn't break travis).

[yarlB]

Thank you for your answer. Something like that?
I don't know what to do about travis.

(I removed unset RUMP_SERVER because the export occurs in a subshell)