Added -erroraction silentlycontinue for import-module (#2778)
Added -erroraction silentlycontinue for import-module (#2778)

If the module is not available it throws an error. To make sure OpenCover
works on PSv4 and below, -erroraction silentlycontinue was added.
PaulHigin/PowerShell,TravisEz13/PowerShell,daxian-dbw/PowerShell,daxian-dbw/PowerShell,TravisEz13/PowerShell,daxian-dbw/PowerShell,JamesWTruher/PowerShell-1,TravisEz13/PowerShell,PaulHigin/PowerShell,JamesWTruher/PowerShell-1,PaulHigin/PowerShell,daxian-dbw/PowerShell,JamesWTruher/PowerShell-1,JamesWTruher/PowerShell-1,TravisEz13/PowerShell,PaulHigin/PowerShell