Add an example for node evacuation

The configuration shows an unbalanced cluster with
a node being drained. The natural evacuation strategy
includes frf-moves.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Hrvoje Ribicic <riba@google.com>

Makefile.am

@@ -1229,6 +1229,7 @@ TEST_FILES = \
 	test/data/htools/hail-node-evac.json \
 	test/data/htools/hail-reloc-drbd.json \
 	test/data/htools/hbal-dyn.data \
+	test/data/htools/hbal-evac.data \
 	test/data/htools/hbal-excl-tags.data \
 	test/data/htools/hbal-split-insts.data \
 	test/data/htools/hspace-tiered-dualspec-exclusive.data \
@@ -1258,6 +1259,7 @@ TEST_FILES = \
 	test/hs/shelltests/htools-dynutil.test \
 	test/hs/shelltests/htools-excl.test \
 	test/hs/shelltests/htools-hail.test \
+	test/hs/shelltests/htools-hbal-evac.test \
 	test/hs/shelltests/htools-hroller.test \
 	test/hs/shelltests/htools-hspace.test \
 	test/hs/shelltests/htools-invalid.test \

test/data/htools/hbal-evac.data

+group-01|fake-uuid-01|preferred||
+
+node-E|4000|0|2000|6000|3000|32|Y|fake-uuid-01|4
+node-1|4000|0|3000|6000|4000|32|N|fake-uuid-01|4
+node-2|4000|0|3000|6000|1000|32|N|fake-uuid-01|4
+node-3|4000|0|2000|6000|2000|32|N|fake-uuid-01|4
+
+inst-p1|1000|1000|1|running|Y|node-E|node-1|drbd||1
+inst-p2|1000|1000|1|running|Y|node-E|node-3|drbd||1
+inst-s1|1000|1000|1|running|Y|node-2|node-E|drbd||1
+inst-12|1000|1000|1|running|Y|node-1|node-2|drbd||1
+inst-32a|1000|1000|1|running|Y|node-3|node-2|drbd||1
+inst-32b|1000|1000|1|running|Y|node-3|node-2|drbd||1
+
+|128,1,1024,1,1,1|128,1,1024,1,1,1;32768,8,1048576,16,8,12|diskless,file,sharedfile,plain,blockdev,drbd,rbd,ext|4.0|32.0
+group-01|128,1,1024,1,1,1|128,1,1024,1,1,1;32768,8,1048576,16,8,12|diskless,file,sharedfile,plain,blockdev,drbd,rbd,ext|4.0|32.0

test/hs/shelltests/htools-hbal-evac.test

+./test/hs/hbal -t $TESTDATA_DIR/hbal-evac.data
+>>>/inst-32. node-3:node-2 => node-2:node-1.*
+(.|
+)*Solution length=4/
+>>>= 0
+
+./test/hs/hbal --evac-mode -t $TESTDATA_DIR/hbal-evac.data
+>>>/a=f r:node-1 f
+(.|
+)*Solution length=3/
+>>>= 0