configure.ac: Add AC_PROG_MKDIR_P for compatibility with Automake <= 1.9.6.
configure.ac: Add AC_PROG_MKDIR_P for compatibility with Automake <= 1.9.6.

Change-Id: Ice491f50e9be7509d093a153247a68b9db858286

MadDogTechnology/opentsdb,sidhhu/opentsdb,MadDogTechnology/opentsdb,ShefronYudy/opentsdb,johann8384/opentsdb,kidaa/opentsdb,alienth/opentsdb,alienth/opentsdb,eswdd/opentsdb,OpenTSDB/opentsdb,OpenTSDB/opentsdb,sidhhu/opentsdb,andyflury/opentsdb,kidaa/opentsdb,OpenTSDB/opentsdb,andyflury/opentsdb,johann8384/opentsdb,MadDogTechnology/opentsdb,eswdd/opentsdb,ShefronYudy/opentsdb