Add function to get uninterrupted bit run

Function bitvec_rl_curbit added to get number of  uninterrupted
bits run in vector starting from the current bit till max number
of bits.
Test case is added to check bitvec_rl_curbit.

Change-Id: Iae153d3639ea6b891c1fc10d7801a435c9492e26
diff --git a/tests/bitvec/bitvec_test.ok b/tests/bitvec/bitvec_test.ok
index e256108..6281973 100644
--- a/tests/bitvec/bitvec_test.ok
+++ b/tests/bitvec/bitvec_test.ok
@@ -166,4 +166,6 @@
 ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ 
 ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ 
 ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ 
+bitvec_runlength....
+
 bitvec ok.