Change '--testTFM' option to '--testRelPath' and default value in run-test.sh

[hseok-oh]

Similar issue with #12440
Test path changed by #12634 (dotnet/buildtools#1121)

• Change option name of --testTFM to --testRelPath to set relative path from project directory to test script.
• Set default value to default.netcoreapp1.1/netcoreapp1.1

cc/ @weshaggard @stephentoub

[stephentoub]

@dotnet-bot Test Innerloop Linux ARM Emulator Release Cross Build please (package restore failure)

[hseok-oh]

@dotnet-bot Test Innerloop Linux ARM Emulator Release Cross Build and Test please

[hseok-oh]

@dotnet-bot Test Innerloop OSX Debug Build and Test please

[hseok-oh]

@dotnet-bot Test Innerloop Linux ARM Emulator Release Cross Build and Test please

[weshaggard]

cc @joperezr

The change looks OK but I will still say we need a better way than needing to manually update this script. We will likely be breaking it more some changes to come.

[hseok-oh]

@dotnet-bot Test Innerloop Linux ARM Emulator Release Cross Build and Test please (package restore failure)

[joperezr]

The change looks OK but I will still say we need a better way than needing to manually update this script. We will likely be breaking it more some changes to come.

I agree. Actually we will break it soon when we move master to netcoreapp1.2 as we will be changing all of the defaults there. In general, we have tried to avoid having the same logic/setting on two places so that we can make changes in a single place.