storage: Skip inactive lv volumes

If the volume is of a clustered volume group, and not active, the
related pool APIs fails on opening /dev/vg/lv. If the volume is
suspended, it hangs on open(2) the volume.

Though the best solution is to expose the volume status in volume
XML, and even better to provide API to activate/deactivate the volume,
but it's not the work I want to touch currently. Volume status in
other status is just fine to skip.

About the 5th field of lv_attr (from man lvs[8])
<quote>
 5 State: (a)ctive, (s)uspended, (I)nvalid snapshot, invalid
   (S)uspended snapshot, snapshot (m)erge failed,suspended
   snapshot (M)erge failed, mapped (d)evice present without
   tables,  mapped device present with (i)nactive table
</quote>

src/storage/storage_backend_logical.c

@@ -78,6 +78,11 @@ virStorageBackendLogicalMakeVol(virStoragePoolObjPtr pool,
     regmatch_t *vars = NULL;
     char *p = NULL;
     int i, err, nextents, nvars, ret = -1;
+    const char *attrs = groups[9];
+
+    /* Skip inactive volume */
+    if (attrs[4] != 'a')
+        return 0;
 
     /* See if we're only looking for a specific volume */
     if (data != NULL) {
@@ -280,14 +285,17 @@ virStorageBackendLogicalFindLVs(virStoragePoolObjPtr pool,
                                 virStorageVolDefPtr vol)
 {
     /*
-     *  # lvs --separator , --noheadings --units b --unbuffered --nosuffix --options "lv_name,origin,uuid,devices,seg_size,vg_extent_size,size" VGNAME
-     *  RootLV,,06UgP5-2rhb-w3Bo-3mdR-WeoL-pytO-SAa2ky,/dev/hda2(0),5234491392,33554432,5234491392
-     *  SwapLV,,oHviCK-8Ik0-paqS-V20c-nkhY-Bm1e-zgzU0M,/dev/hda2(156),1040187392,33554432,1040187392
-     *  Test2,,3pg3he-mQsA-5Sui-h0i6-HNmc-Cz7W-QSndcR,/dev/hda2(219),1073741824,33554432,1073741824
-     *  Test3,,UB5hFw-kmlm-LSoX-EI1t-ioVd-h7GL-M0W8Ht,/dev/hda2(251),2181038080,33554432,2181038080
-     *  Test3,Test2,UB5hFw-kmlm-LSoX-EI1t-ioVd-h7GL-M0W8Ht,/dev/hda2(187),1040187392,33554432,1040187392
+     * # lvs --separator , --noheadings --units b --unbuffered --nosuffix --options \
+     * "lv_name,origin,uuid,devices,seg_size,vg_extent_size,size,lv_attr" VGNAME
+     *
+     * RootLV,,06UgP5-2rhb-w3Bo-3mdR-WeoL-pytO-SAa2ky,/dev/hda2(0),5234491392,33554432,5234491392,-wi-ao
+     * SwapLV,,oHviCK-8Ik0-paqS-V20c-nkhY-Bm1e-zgzU0M,/dev/hda2(156),1040187392,33554432,1040187392,-wi-ao
+     * Test2,,3pg3he-mQsA-5Sui-h0i6-HNmc-Cz7W-QSndcR,/dev/hda2(219),1073741824,33554432,1073741824,owi-a-
+     * Test3,,UB5hFw-kmlm-LSoX-EI1t-ioVd-h7GL-M0W8Ht,/dev/hda2(251),2181038080,33554432,2181038080,-wi-a-
+     * Test3,Test2,UB5hFw-kmlm-LSoX-EI1t-ioVd-h7GL-M0W8Ht,/dev/hda2(187),1040187392,33554432,1040187392,swi-a-
      *
-     * Pull out name, origin, & uuid, device, device extent start #, segment size, extent size.
+     * Pull out name, origin, & uuid, device, device extent start #,
+     * segment size, extent size, size, attrs
      *
      * NB can be multiple rows per volume if they have many extents
      *
@@ -299,10 +307,10 @@ virStorageBackendLogicalFindLVs(virStoragePoolObjPtr pool,
      *    striped, so "," is not a suitable separator either (rhbz 727474).
      */
     const char *regexes[] = {
-       "^\\s*(\\S+)#(\\S*)#(\\S+)#(\\S+)#(\\S+)#([0-9]+)#(\\S+)#([0-9]+)#([0-9]+)#?\\s*$"
+       "^\\s*(\\S+)#(\\S*)#(\\S+)#(\\S+)#(\\S+)#([0-9]+)#(\\S+)#([0-9]+)#([0-9]+)#(\\S+)#?\\s*$"
     };
     int vars[] = {
-        9
+        10
     };
     int ret = -1;
     virCommandPtr cmd;
@@ -313,7 +321,8 @@ virStorageBackendLogicalFindLVs(virStoragePoolObjPtr pool,
                                "--units", "b",
                                "--unbuffered",
                                "--nosuffix",
-                               "--options", "lv_name,origin,uuid,devices,segtype,stripes,seg_size,vg_extent_size,size",
+                               "--options",
+                               "lv_name,origin,uuid,devices,segtype,stripes,seg_size,vg_extent_size,size,lv_attr",
                                pool->def->source.name,
                                NULL);
     if (virStorageBackendRunProgRegex(pool,