ARROW-925: [GLib] Fix GArrowBufferReader test
ARROW-925: [GLib] Fix GArrowBufferReader test

GArrowReadable#read API was changed.

Author: Kouhei Sutou <kou@clear-code.com>

Closes #622 from kou/glib-fix-buffer-reader-test and squashes the following commits:

e41374b [Kouhei Sutou] [GLib] Fix GArrowBufferReader test

pcmoritz/arrow,majetideepak/arrow,NonVolatileComputing/arrow,itaiin/arrow,siddharthteotia/arrow,cpcloud/arrow,jeffknupp/arrow,cpcloud/arrow,icexelloss/arrow,dremio/arrow,majetideepak/arrow,pcmoritz/arrow,cpcloud/arrow,icexelloss/arrow,icexelloss/arrow,dremio/arrow,majetideepak/arrow,dremio/arrow,icexelloss/arrow,apache/arrow,laurentgo/arrow,apache/arrow,pcmoritz/arrow,itaiin/arrow,laurentgo/arrow,wagavulin/arrow,kou/arrow,wesm/arrow,wesm/arrow,itaiin/arrow,itaiin/arrow,NonVolatileComputing/arrow,renesugar/arrow,dremio/arrow,itaiin/arrow,wagavulin/arrow,cpcloud/arrow,dremio/arrow,majetideepak/arrow,renesugar/arrow,laurentgo/arrow,xhochy/arrow,apache/arrow,icexelloss/arrow,wesm/arrow,laurentgo/arrow,pcmoritz/arrow,xhochy/arrow,renesugar/arrow,wagavulin/arrow,renesugar/arrow,siddharthteotia/arrow,majetideepak/arrow,apache/arrow,jeffknupp/arrow,xhochy/arrow,kou/arrow,kou/arrow,NonVolatileComputing/arrow,xhochy/arrow,yufeldman/arrow,jeffknupp/arrow,tebeka/arrow,tebeka/arrow,wesm/arrow,kou/arrow,apache/arrow,apache/arrow,kou/arrow,wesm/arrow,majetideepak/arrow,xhochy/arrow,apache/arrow,kou/arrow,yufeldman/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,yufeldman/arrow,yufeldman/arrow,majetideepak/arrow,pcmoritz/arrow,pcmoritz/arrow,apache/arrow,itaiin/arrow,majetideepak/arrow,tebeka/arrow,xhochy/arrow,icexelloss/arrow,jeffknupp/arrow,renesugar/arrow,apache/arrow,xhochy/arrow,tebeka/arrow,yufeldman/arrow,icexelloss/arrow,kou/arrow,tebeka/arrow,apache/arrow,jeffknupp/arrow,yufeldman/arrow,kou/arrow,yufeldman/arrow,wagavulin/arrow,kou/arrow,tebeka/arrow,pcmoritz/arrow,jeffknupp/arrow,renesugar/arrow,renesugar/arrow,xhochy/arrow,jeffknupp/arrow,pcmoritz/arrow,icexelloss/arrow,laurentgo/arrow,laurentgo/arrow,icexelloss/arrow,siddharthteotia/arrow,yufeldman/arrow,cpcloud/arrow,majetideepak/arrow,NonVolatileComputing/arrow,kou/arrow,xhochy/arrow,wesm/arrow,itaiin/arrow,wagavulin/arrow,NonVolatileComputing/arrow,siddharthteotia/arrow,renesugar/arrow,itaiin/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,xhochy/arrow,renesugar/arrow,icexelloss/arrow,pcmoritz/arrow,tebeka/arrow,cpcloud/arrow,laurentgo/arrow,pcmoritz/arrow,laurentgo/arrow,jeffknupp/arrow,wesm/arrow,icexelloss/arrow,siddharthteotia/arrow,wagavulin/arrow,dremio/arrow,dremio/arrow,jeffknupp/arrow,itaiin/arrow,yufeldman/arrow,cpcloud/arrow,itaiin/arrow,wesm/arrow,wesm/arrow,renesugar/arrow,xhochy/arrow,wagavulin/arrow,laurentgo/arrow,tebeka/arrow,siddharthteotia/arrow,siddharthteotia/arrow,siddharthteotia/arrow,majetideepak/arrow,wagavulin/arrow,renesugar/arrow,laurentgo/arrow,cpcloud/arrow,icexelloss/arrow,tebeka/arrow,dremio/arrow,wagavulin/arrow,kou/arrow,cpcloud/arrow,kou/arrow,majetideepak/arrow,xhochy/arrow,NonVolatileComputing/arrow,apache/arrow,wesm/arrow,pcmoritz/arrow,laurentgo/arrow,cpcloud/arrow,laurentgo/arrow,icexelloss/arrow,wagavulin/arrow,apache/arrow,laurentgo/arrow,siddharthteotia/arrow,laurentgo/arrow,renesugar/arrow,majetideepak/arrow,icexelloss/arrow,kou/arrow,tebeka/arrow,apache/arrow,xhochy/arrow,itaiin/arrow,itaiin/arrow,majetideepak/arrow,cpcloud/arrow,pcmoritz/arrow,kou/arrow,renesugar/arrow,wagavulin/arrow,itaiin/arrow,yufeldman/arrow,cpcloud/arrow,cpcloud/arrow,cpcloud/arrow,siddharthteotia/arrow,dremio/arrow,NonVolatileComputing/arrow,wesm/arrow,jeffknupp/arrow,wesm/arrow,itaiin/arrow,renesugar/arrow,dremio/arrow,dremio/arrow,jeffknupp/arrow,wesm/arrow,majetideepak/arrow,majetideepak/arrow,xhochy/arrow,yufeldman/arrow,wesm/arrow,apache/arrow,xhochy/arrow,NonVolatileComputing/arrow,laurentgo/arrow,siddharthteotia/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,wagavulin/arrow,itaiin/arrow,renesugar/arrow