Fix two bugs in VoltProcedure stats collection where the min and max execution time values were not being set correctly.
Fix two bugs in VoltProcedure stats collection where the min and max execution time values were not being set correctly.

deerwalk/voltdb,paulmartel/voltdb,zuowang/voltdb,ingted/voltdb,kumarrus/voltdb,flybird119/voltdb,deerwalk/voltdb,flybird119/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,kobronson/cs-voltdb,kumarrus/voltdb,zuowang/voltdb,ingted/voltdb,zuowang/voltdb,migue/voltdb,VoltDB/voltdb,paulmartel/voltdb,creative-quant/voltdb,simonzhangsm/voltdb,kobronson/cs-voltdb,deerwalk/voltdb,creative-quant/voltdb,zuowang/voltdb,migue/voltdb,VoltDB/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,ingted/voltdb,creative-quant/voltdb,VoltDB/voltdb,deerwalk/voltdb,migue/voltdb,wolffcm/voltdb,kumarrus/voltdb,wolffcm/voltdb,kobronson/cs-voltdb,simonzhangsm/voltdb,creative-quant/voltdb,wolffcm/voltdb,migue/voltdb,paulmartel/voltdb,migue/voltdb,simonzhangsm/voltdb,zuowang/voltdb,kumarrus/voltdb,flybird119/voltdb,ingted/voltdb,flybird119/voltdb,wolffcm/voltdb,deerwalk/voltdb,flybird119/voltdb,simonzhangsm/voltdb,ingted/voltdb,wolffcm/voltdb,kobronson/cs-voltdb,ingted/voltdb,migue/voltdb,VoltDB/voltdb,wolffcm/voltdb,paulmartel/voltdb,paulmartel/voltdb,creative-quant/voltdb,deerwalk/voltdb,kobronson/cs-voltdb,zuowang/voltdb,kumarrus/voltdb,kobronson/cs-voltdb,creative-quant/voltdb,flybird119/voltdb,kobronson/cs-voltdb,kumarrus/voltdb,flybird119/voltdb,paulmartel/voltdb,paulmartel/voltdb,flybird119/voltdb,creative-quant/voltdb,simonzhangsm/voltdb,migue/voltdb,deerwalk/voltdb,ingted/voltdb,wolffcm/voltdb,VoltDB/voltdb,ingted/voltdb,migue/voltdb,zuowang/voltdb,paulmartel/voltdb,deerwalk/voltdb,zuowang/voltdb,kobronson/cs-voltdb,VoltDB/voltdb,kumarrus/voltdb,creative-quant/voltdb,wolffcm/voltdb