Finally wire-up virAdmServer{Get,Set}ClientLimits APIs into virt-admin client.
Update the virt-admin's man page accordingly.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

Enable the client disconnect within virt-admin. Also, update the man page
accordingly.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

Wire-up the client identity getter into virt-admin tool. This patch adjusts
man-page accordingly.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

Wire-up the public client listing API. Along with this change, a private time
simple conversion method to interpret client's timestamp obtained from server
has been added as well. Format used to for time output is as follows:
YYYY-mm-DD HH:MM:SS+ZZZZ.

Although libvirt exposes methods time-related methods through virtime.h
internally, it utilizes millisecond precision which we don't need in this case,
especially when connection timestamps use precision to seconds only.
This is just a convenience int to string conversion method.

To reflect the new API, man page has been adjusted accordingly.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

Use L<> instead of C<> for URLs and man pages.

Wire up the server threadpool tunable APIs to virt-admin client. Also, provide
a man page for both commands.
Signed-off-by: NErik Skultety <eskultet@redhat.com>