build: teach osv-version.sh not to pick up random tags

Otherwise the build blows up when some regex doesn't match.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
tests: fix tst-dlfcn

info.dli_sname can be null; account for it.

Suggested by Nadav.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
tests: reduce rcu hashtable test running time

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
EC2 simulator: Add metadata API for Cassandra autoconfig

This adds more metadata APIs that are needed by Cassandra's EC2 cluster
auto-configuration service called Datastax Reflector.

Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>