Explicit LD_LIBRARY_PATH for relocatability [backport]
Explicit LD_LIBRARY_PATH for relocatability [backport]

Some packagers/installers, like rpm post-install scripts, implement
install-time relocatability by searching+replacing "/opt/couchbase"
with "/some/user/chosen/path".  An explicit LD_LIBRARY_PATH allows it
to be automatically fixed at install-time.

Original-Change-Id: I25cd0312eca26724c029e5f386abcc46e3450188

Change-Id: I35cd0312eca26724c029e5f386abcc46e3450188
Reviewed-on: http://review.couchbase.org/13232
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

mschoch/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,vzasade/ns_server,ceejatec/ns_server,nimishzynga/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,ceejatec/ns_server,vzasade/ns_server,pavel-blagodov/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,daverigby/ns_server,daverigby/ns_server,vzasade/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,membase/ns_server,membase/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,membase/ns_server,daverigby/ns_server,nimishzynga/ns_server,daverigby/ns_server,mschoch/ns_server,vzasade/ns_server,pavel-blagodov/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,mschoch/ns_server,nimishzynga/ns_server