Example LV bcache conversion

--- 2TB-vg-cfg.orig 2019-11-15 15:08:54.533398154 +0700
+++ 2TB-vg-cfg  2019-11-15 15:50:22.303802956 +0700
@@ -63,10 +63,21 @@
            flags = []
            creation_time = 1511064191  # 2017-11-19 11:03:11 +0700
            creation_host = "svelte"
-           segment_count = 4
+           segment_count = 5

            segment1 {
                start_extent = 0
+               extent_count = 1
+
+               type = "striped"
+               stripe_count = 1    # linear
+
+               stripes = [
+                   "pv2", 177406
+               ]
+           }
+           segment2 {
+               start_extent = 1
                extent_count = 129782   # 506.961 Gigabytes

                type = "striped"
@@ -76,8 +87,8 @@
                    "pv0", 0
                ]
            }
-           segment2 {
-               start_extent = 129782
+           segment3 {
+               start_extent = 129783
                extent_count = 19968    # 78 Gigabytes

                type = "striped"
@@ -87,8 +98,8 @@
                    "pv1", 149749
                ]
            }
-           segment3 {
-               start_extent = 149750
+           segment4 {
+               start_extent = 149751
                extent_count = 149749   # 584.957 Gigabytes

                type = "striped"
@@ -98,8 +109,8 @@
                    "pv1", 0
                ]
            }
-           segment4 {
-               start_extent = 299499
+           segment5 {
+               start_extent = 299500
                extent_count = 177406   # 692.992 Gigabytes

                type = "striped"