If run on an empty build directory, taskexp wasn't working as it didn't
send the current environment to the server. This means HOSTTOOLS in oe-core
couldn't be built and gave an error. Add the missing updateToServer call in.
[YOCTO #14408]
(Bitbake rev: 06a0bbe746f879ae539223e7fdb6f07d55d13719)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>