Fix handling of whitespae in preprocessor macros for API generator

The apibuild.py script did not handle whitespace in preprocessor
macros, so it failed to detect constants declared with '# define'
instead of '#define'. Since we now correctly indent our public
header files, we have silently lost all constants from
libvirt-api.xml. This also caused us to not detect formatting
errors in constant docs
qemu: process: Avoid uninitialized use two vars when reconnecting to vm

3ecebf07110ca8d3413072557f29137943e848e3 breaks the build as it adds a
way to jump to cleanup before the 'cfg' object is retrieved and 'priv'
is initialized.
docs: storage: fix rbd pool indentation
conf: Rework virDomainObjListFindByUUID to allow more concurrent APIs

Currently, when there is an API that's blocking with locked domain and
second API that's waiting in virDomainObjListFindByUUID() for the domain
lock (with the domain list locked) no other API can be executed on any
domain on the whole hypervisor because all would wait for the domain
list to be locked.  This patch adds new optional approach to this in
which the domain is only ref'd (reference counter is incremented)
instead of being locked and is locked *after* the list itself is
unlocked.  We might consider only ref'ing the domain in the future and
leaving locking on particular APIs, but that's no tonight's fairy tale.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
qemu: completely rework reference counting

There is one problem that causes various errors in the daemon.  When
domain is waiting for a job, it is unlocked while waiting on the
condition.  However, if that domain is for example transient and being
removed in another API (e.g. cancelling incoming migration), it get's
unref'd.  If the first call, that was waiting, fails to get the job, it
unref's the domain object, and because it was the last reference, it
causes clearing of the whole domain object.  However, when finishing the
call, the domain must be unlocked, but there is no way for the API to
know whether it was cleaned or not (unless there is some ugly temporary
variable, but let's scratch that).

The root cause is that our APIs don't ref the objects they are using and
all use the implicit reference that the object has when it is in the
domain list.  That reference can be removed when the API is waiting for
a job.  And because each domain doesn't do its ref'ing, it results in
the ugly checking of the return value of virObjectUnref() that we have
everywhere.

This patch changes qemuDomObjFromDomain() to ref the domain (using
virDomainObjListFindByUUIDRef()) and adds qemuDomObjEndAPI() which
should be the only function in which the return value of
virObjectUnref() is checked.  This makes all reference counting
deterministic and makes the code a bit clearer.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>