daemon: fix leak after listing all volumes

CVE-2013-1962

remoteDispatchStoragePoolListAllVolumes wasn't freeing the pool.
The pool also held a reference to the connection, preventing it from
getting freed and closing the netcf interface driver, which held two
sockets open.
(cherry picked from commit ca697e90d5bd6a6dfb94bfb6d4438bdf9a44b739)
virsh: edit: don't leak XML string on reedit or redefine

Free the old XML strings before overwriting them if the user
has chosen to reedit the file or force the redefinition.

Found by Alex Jia trying to reproduce another bug:
https://bugzilla.redhat.com/show_bug.cgi?id=977430#c3
(cherry picked from commit 1e3a252974c8e5c650f1d84dc2b167f0ae8cee3c)
Fix invalid read in virCgroupGetValueStr

Don't check for '\n' at the end of file if zero bytes were read.

Found by valgrind:
==404== Invalid read of size 1
==404==    at 0x529B09F: virCgroupGetValueStr (vircgroup.c:540)
==404==    by 0x529AF64: virCgroupMoveTask (vircgroup.c:1079)
==404==    by 0x1EB475: qemuSetupCgroupForEmulator (qemu_cgroup.c:1061)
==404==    by 0x1D9489: qemuProcessStart (qemu_process.c:3801)
==404==    by 0x18557E: qemuDomainObjStart (qemu_driver.c:5787)
==404==    by 0x190FA4: qemuDomainCreateWithFlags (qemu_driver.c:5839)

Introduced by 0d0b409.

https://bugzilla.redhat.com/show_bug.cgi?id=978356
(cherry picked from commit 306c49ffd56a1c72b1892d50f2a75531c62f4a1d)
bridge: don't crash on bandwidth unplug with no bandwidth

If networkUnplugBandwidth is called on a network which has
no bandwidth defined, print a warning instead of crashing.

This can happen when destroying a domain with bandwidth if
bandwidth was removed from the network after the domain was
started.

https://bugzilla.redhat.com/show_bug.cgi?id=975359
(cherry picked from commit 658c932ab4aec2222b0ce3840a96748e73b39b3f)
Merge branch 'v1.0.2-maint' into mc+rdma-v1.0.2-maint