Updated test script to kill iOS sim before running.
Updated test script to kill iOS sim before running.

xcodebuild test will fail if the iOS simulator is in a non-responsive
state to the remote client (aka, xcodebuild). Explicitly closing
the simulator before running tests will prevent this issue from
surfacing in command line test runs.

alexbasson/Nimble,dgdosen/Nimble,joemasilotti/Nimble,octo-technology/Nimble,DanielAsher/Nimble,romankl/Nimble,AnthonyMDev/Nimble,briancroom/Nimble,mrackwitz/Nimble,jrmiddle/Nimble,rbeeger/Nimble,msdgwzhy6/Nimble,twobitlabs/Nimble,gfontenot/Nimble,jeffh/Nimble,phatblat/Nimble,NatashaTheRobot/Nimble,ashfurrow/Nimble,github/Nimble,nikita-leonov/Nimble,joemasilotti/Nimble,mishimay/Nimble,romankl/Nimble,msdgwzhy6/Nimble,Quick/Nimble,alexbasson/Nimble,romankl/Nimble,twobitlabs/Nimble,jeffh/Nimble,msdgwzhy6/Nimble,alexbasson/Nimble,alvinvarghese/Nimble,alvinvarghese/Nimble,vtongcoder/Nimble,rbeeger/Nimble,msdgwzhy6/Nimble,abbeycode/Nimble,abbeycode/Nimble,mrackwitz/Nimble,mrackwitz/Nimble,joemasilotti/Nimble,jrmiddle/Nimble,gfontenot/Nimble,rbeeger/Nimble,Quick/Nimble,mrackwitz/Nimble,alvinvarghese/Nimble,makezwl/zhao,NatashaTheRobot/Nimble,feinstruktur/Nimble,twobitlabs/Nimble,romankl/Nimble,nikita-leonov/Nimble,alexbasson/Nimble,dgdosen/Nimble,mishimay/Nimble,abbeycode/Nimble,NatashaTheRobot/Nimble,ashfurrow/Nimble,briancroom/Nimble,makezwl/zhao,vtongcoder/Nimble,github/Nimble,Quick/Nimble,dgdosen/Nimble,ashfurrow/Nimble,nikita-leonov/Nimble,gfontenot/Nimble,jeffh/Nimble,vtongcoder/Nimble,rbeeger/Nimble,phatblat/Nimble,gfontenot/Nimble,AnthonyMDev/Nimble,feinstruktur/Nimble,briancroom/Nimble,alvinvarghese/Nimble,jrmiddle/Nimble,NatashaTheRobot/Nimble,jrmiddle/Nimble,briancroom/Nimble,AnthonyMDev/Nimble,feinstruktur/Nimble,octo-technology/Nimble,phatblat/Nimble,ScottRobbins/Nimble,dgdosen/Nimble,DanielAsher/Nimble,DanielAsher/Nimble,ScottRobbins/Nimble,jeffh/Nimble,mishimay/Nimble,makezwl/zhao,abbeycode/Nimble,octo-technology/Nimble,octo-technology/Nimble,ScottRobbins/Nimble