Fix buildall to generate all the make files.
Fix buildall to generate all the make files.

With a recent change to buildall, the command that generates all the make files from
$IMPALA_HOME was removed. This is causing builds to hang, and no target are found. I also
added the -x flag to make buildall easier to debug.

Change-Id: I33ad8f197658f932f4da01ae3186a5eede5326be
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2095
Reviewed-by: Matthew Jacobs <df2fa7c39d141dc5dc5589fed74180e757ed6c9a@cloudera.com>
Reviewed-by: Nong Li <99a5e5f8f5911755b88e0b536d46aafa102bed41@cloudera.com>
Reviewed-by: Lenni Kuff <724b7df200764f5dc1b723c05ee6c6adabd11bb1@cloudera.com>
Tested-by: jenkins

andybab/Impala,andybab/Impala,rampage644/impala-cut,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo,gistic/PublicSpatialImpala,AtScaleInc/Impala,andybab/Impala,placrosse/ImpalaToGo,AtScaleInc/Impala,ImpalaToGo/ImpalaToGo,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,andybab/Impala,AtScaleInc/Impala,AtScaleInc/Impala,gistic/PublicSpatialImpala,placrosse/ImpalaToGo,rampage644/impala-cut,rampage644/impala-cut,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,ImpalaToGo/ImpalaToGo,gistic/PublicSpatialImpala,AtScaleInc/Impala,rampage644/impala-cut,andybab/Impala,ImpalaToGo/ImpalaToGo,gistic/PublicSpatialImpala,andybab/Impala,rampage644/impala-cut,rampage644/impala-cut,AtScaleInc/Impala,gistic/PublicSpatialImpala,placrosse/ImpalaToGo,placrosse/ImpalaToGo