python: keep consistent handling of Python integer conversion

libvirt_ulonglongUnwrap requires the integer type of python obj.
But libvirt_longlongUnwrap still could handle python obj of
Pyfloat_type which causes the float value to be rounded up
to an integer.

For example
 >>> dom.setSchedulerParameters({'vcpu_quota': 0.88})
 0
libvirt_longlongUnwrap treats 0.88 as a valid value 0

However
 >>> dom.setSchedulerParameters({'cpu_shares': 1000.22})
libvirt_ulonglongUnwrap will throw out an error
"TypeError: an integer is required"

The patch make this consistent.

python/typewrappers.c

@@ -220,7 +220,7 @@ libvirt_ulongUnwrap(PyObject *obj, unsigned long *val)
 int
 libvirt_longlongUnwrap(PyObject *obj, long long *val)
 {
-    long long llong_val;
+    long long llong_val = -1;
 
     if (!obj) {
         PyErr_SetString(PyExc_TypeError, "unexpected type");
@@ -230,7 +230,11 @@ libvirt_longlongUnwrap(PyObject *obj, long long *val)
     /* If obj is of PyInt_Type, PyLong_AsLongLong
      * will call PyInt_AsLong() to handle it automatically.
      */
-    llong_val = PyLong_AsLongLong(obj);
+    if (PyInt_Check(obj) || PyLong_Check(obj))
+        llong_val = PyLong_AsLongLong(obj);
+    else
+        PyErr_SetString(PyExc_TypeError, "an integer is required");
+
     if ((llong_val == -1) && PyErr_Occurred())
         return -1;