Update RunInitShutdownScript script invocation.
Update RunInitShutdownScript script invocation.

PS scripts that are invoked via Invoke-Expression; will automatically
scope variable/function scopes to the script; so it's not necessary to
launch script within a new PowerShell process. This also has a benefit
of allowing debugger to break into init/shutdown scripts launched by
LISA.

senugala/lis-test,lixuemin2016/lis-test,ampintilie/lis-test,lixuemin2016/lis-test,ilenghel/lis-test,HuijingHei/lis-test,adriansuhov/lis-test,bogdancarpusor/lis-test,ilenghel/lis-test,mihaico/lis-test,chvalean/lis-test,ampintilie/lis-test,bogdancarpusor/lis-test,LIS/lis-test,chvalean/lis-test,senugala/lis-test,adriansuhov/lis-test,mihaico/lis-test,HuijingHei/lis-test,LIS/lis-test,mihaico/lis-test,ilenghel/lis-test,chvalean/lis-test,ampintilie/lis-test,HuijingHei/lis-test,bogdancarpusor/lis-test,lixuemin2016/lis-test,ilenghel/lis-test,ampintilie/lis-test,chvalean/lis-test,senugala/lis-test,lixuemin2016/lis-test,LIS/lis-test,adriansuhov/lis-test,LIS/lis-test,HuijingHei/lis-test,adriansuhov/lis-test