Log Message:
Upgrade opendnssec to version 1.4.9.

Upstream changes:
News:
  The main motivations for this release are bug fixes related to use
  cases with large number of zones (more than 50 zones) in combination
  with an XFR based setup. Too much concurrent zone transfers causes
  new transfers to be held back. These excess transfers however were
  not properly scheduled for later.

  No migration steps needed when upgrading from OpenDNSSEC 1.4.8.

Bugfixes:
 * Add TCP waiting queue. Fix signer getting `stuck' when adding
   many zones at once. Thanks to Havard Eidnes to bringing this
   to our attention.
 * OPENDNSSEC-723: received SOA serial reported as on disk.
 * Fix potential locking issue on SOA serial.
 * Crash on shutdown. At all times join xfr and dns handler threads.
 * Make handling of notifies more consistent. Previous implementation
   would bounce between code paths.