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This function disables the reverse DNS lookup on QEMU targets to reduce the delay when using static IP address. By disabling DNS lookup we can save a great deal of time during automated testing on the autobuilder (on the order of ~400 seconds per ssh tranaction). This is seen when using the testimage, there is a delay getting logged-in from the server to target. It's enabled for all qemu imgaes by default and can be overridden by setting the SSH_DISABLE_DNS_LOOKUP variable. [YOCTO #5954] (From OE-Core rev: c93eeecb15c4acac9226a3394c93d7e99a809d6b) Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>