Close tcp sockets upon exec

(cherry picked from commit 6c4d5a51c44a4634241f7bafcb3630bf0b751e13)
oob/tcp: display a warning only from orted/mpirun if no loopback
interface is found
Fix some type declarations so make check works for SPARC. Thanks to Paul Hargrove for the report and correction
Merge pull request #121 from rhc54/cmr/leaks

Close tcp sockets upon exec
Merge pull request #123 from rhc54/cmr/datatype-test

Fix some type declarations so make check works for SPARC.
Merge pull request #122 from ggouaillardet/topic/oob_loopback

oob/tcp: display a warning only from orted/mpirun if no loopback
Merge remote-tracking branch 'release/v1.8' into topic/sync_with_ompi