dnsmasq: Fix parsing of the version number

If debugging is enabled, the debug messages are sent to stderr.
Moreover, if a command has catching of stderr set, the messages
gets mixed with stdout output (assuming both outputs are stored
in the same variable). The resulting string then doesn't
necessarily have to start with desired prefix then. This bug
exposes itself when parsing dnsmasq output:

2012-12-06 11:18:11.445+0000: 18491: error :
dnsmasqCapsSetFromBuffer:664 : internal error cannot parse
/usr/sbin/dnsmasq version number in '2012-12-06
11:11:02.232+0000: 18492: debug : virFileClose:72 : Closed fd 22'

We can clearly see that the output of dnsmasq --version doesn't
start with expected "Dnsmasq version " string but a libvirt debug
output.

src/util/dnsmasq.c

@@ -715,7 +715,6 @@ dnsmasqCapsRefreshInternal(dnsmasqCapsPtr caps, bool force)
 
     cmd = virCommandNewArgList(caps->binaryPath, "--version", NULL);
     virCommandSetOutputBuffer(cmd, &version);
-    virCommandSetErrorBuffer(cmd, &version);
     virCommandAddEnvPassCommon(cmd);
     virCommandClearCaps(cmd);
     if (virCommandRun(cmd, NULL) < 0) {
@@ -727,7 +726,6 @@ dnsmasqCapsRefreshInternal(dnsmasqCapsPtr caps, bool force)
 
     cmd = virCommandNewArgList(caps->binaryPath, "--help", NULL);
     virCommandSetOutputBuffer(cmd, &help);
-    virCommandSetErrorBuffer(cmd, &help);
     virCommandAddEnvPassCommon(cmd);
     virCommandClearCaps(cmd);
     if (virCommandRun(cmd, NULL) < 0) {