HPCC-10875 Uninitialized member variables in ccdserver.cpp

All were in fact initialized before use, but this helps prevent warnings from
Eclipse and Coverity (and possible future errors).

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #5420 from richardkchapman/uninit-warnings

HPCC-10875 Uninitialized member variables in ccdserver.cpp