[FLINK-6286] [scripts] Print error for 'hbase not found'
[FLINK-6286] [scripts] Print error for 'hbase not found'

Previously if HBASE_CONF_DIR was set then `hbase classpath` was run and
appended to INTERNAL_HADOOP_CLASSPATHS. Now when HBASE_CONF_DIR is set
HBASE_HOME or PATH is checked for 'hbase' and if not found a warning is
printed and INTERNAL_HADOOP_CLASSPATHS is not updated.

This closes #3711

zentol/flink,WangTaoTheTonic/flink,jinglining/flink,GJL/flink,gyfora/flink,fhueske/flink,kaibozhou/flink,greghogan/flink,ueshin/apache-flink,twalthr/flink,sunjincheng121/flink,tillrohrmann/flink,godfreyhe/flink,zimmermatt/flink,fanzhidongyzby/flink,hongyuhong/flink,tzulitai/flink,tony810430/flink,rmetzger/flink,darionyaphet/flink,hwstreaming/flink,kl0u/flink,hequn8128/flink,tzulitai/flink,jinglining/flink,twalthr/flink,clarkyzl/flink,zentol/flink,StephanEwen/incubator-flink,twalthr/flink,zohar-mizrahi/flink,tillrohrmann/flink,lincoln-lil/flink,fanyon/flink,ueshin/apache-flink,mtunique/flink,yew1eb/flink,mtunique/flink,zentol/flink,zentol/flink,twalthr/flink,tzulitai/flink,zohar-mizrahi/flink,GJL/flink,ueshin/apache-flink,yew1eb/flink,zhangminglei/flink,godfreyhe/flink,yew1eb/flink,wwjiang007/flink,mbode/flink,gyfora/flink,darionyaphet/flink,fanzhidongyzby/flink,bowenli86/flink,tony810430/flink,mbode/flink,sunjincheng121/flink,StephanEwen/incubator-flink,greghogan/flink,zjureel/flink,godfreyhe/flink,WangTaoTheTonic/flink,lincoln-lil/flink,fanyon/flink,aljoscha/flink,bowenli86/flink,tony810430/flink,fanyon/flink,hequn8128/flink,Xpray/flink,darionyaphet/flink,xccui/flink,jinglining/flink,lincoln-lil/flink,shaoxuan-wang/flink,tony810430/flink,gustavoanatoly/flink,apache/flink,xccui/flink,wwjiang007/flink,tzulitai/flink,lincoln-lil/flink,zentol/flink,kaibozhou/flink,tzulitai/flink,shaoxuan-wang/flink,bowenli86/flink,gyfora/flink,fhueske/flink,mtunique/flink,tony810430/flink,Xpray/flink,mylog00/flink,fhueske/flink,ueshin/apache-flink,tillrohrmann/flink,rmetzger/flink,wwjiang007/flink,shaoxuan-wang/flink,rmetzger/flink,godfreyhe/flink,zimmermatt/flink,mbode/flink,wwjiang007/flink,aljoscha/flink,jinglining/flink,hequn8128/flink,aljoscha/flink,hwstreaming/flink,jinglining/flink,mtunique/flink,jinglining/flink,sunjincheng121/flink,fanzhidongyzby/flink,hequn8128/flink,zhangminglei/flink,kaibozhou/flink,WangTaoTheTonic/flink,PangZhi/flink,greghogan/flink,lincoln-lil/flink,yew1eb/flink,bowenli86/flink,StephanEwen/incubator-flink,zjureel/flink,haohui/flink,clarkyzl/flink,apache/flink,apache/flink,fhueske/flink,gustavoanatoly/flink,zohar-mizrahi/flink,kaibozhou/flink,aljoscha/flink,gyfora/flink,zjureel/flink,hongyuhong/flink,kl0u/flink,hongyuhong/flink,wwjiang007/flink,hequn8128/flink,tillrohrmann/flink,fanzhidongyzby/flink,mylog00/flink,tony810430/flink,kaibozhou/flink,mylog00/flink,clarkyzl/flink,godfreyhe/flink,lincoln-lil/flink,hequn8128/flink,twalthr/flink,tillrohrmann/flink,gyfora/flink,zimmermatt/flink,tillrohrmann/flink,zohar-mizrahi/flink,WangTaoTheTonic/flink,StephanEwen/incubator-flink,rmetzger/flink,PangZhi/flink,tillrohrmann/flink,darionyaphet/flink,zentol/flink,zjureel/flink,shaoxuan-wang/flink,shaoxuan-wang/flink,hongyuhong/flink,xccui/flink,clarkyzl/flink,GJL/flink,StephanEwen/incubator-flink,rmetzger/flink,fanzhidongyzby/flink,aljoscha/flink,twalthr/flink,mbode/flink,PangZhi/flink,zjureel/flink,apache/flink,gyfora/flink,tzulitai/flink,bowenli86/flink,hwstreaming/flink,yew1eb/flink,mylog00/flink,Xpray/flink,kaibozhou/flink,shaoxuan-wang/flink,ueshin/apache-flink,zentol/flink,gustavoanatoly/flink,fanyon/flink,wwjiang007/flink,haohui/flink,Xpray/flink,greghogan/flink,sunjincheng121/flink,zimmermatt/flink,gustavoanatoly/flink,sunjincheng121/flink,mtunique/flink,hwstreaming/flink,mylog00/flink,kl0u/flink,zjureel/flink,kl0u/flink,bowenli86/flink,zjureel/flink,zhangminglei/flink,fanyon/flink,hwstreaming/flink,xccui/flink,godfreyhe/flink,zhangminglei/flink,aljoscha/flink,apache/flink,Xpray/flink,xccui/flink,apache/flink,greghogan/flink,kl0u/flink,fhueske/flink,rmetzger/flink,zhangminglei/flink,GJL/flink,greghogan/flink,haohui/flink,zohar-mizrahi/flink,GJL/flink,GJL/flink,StephanEwen/incubator-flink,haohui/flink,PangZhi/flink,tony810430/flink,mbode/flink,PangZhi/flink,darionyaphet/flink,fhueske/flink,sunjincheng121/flink,godfreyhe/flink,WangTaoTheTonic/flink,wwjiang007/flink,gustavoanatoly/flink,xccui/flink,hongyuhong/flink,gyfora/flink,xccui/flink,lincoln-lil/flink,rmetzger/flink,haohui/flink,twalthr/flink,clarkyzl/flink,kl0u/flink,zimmermatt/flink,apache/flink