Revert "By request, add a --verbose option to LNT nt, which prints out what all the sub-commands are doing while also logging their output to a file."

This reverts commit r195509.  As was discussed on the list, the output from subcommands makes the buildbot's logs hard to read.   Revert this while alternatives are discussed.

git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@198523 91177308-0d34-0410-b5e6-96231b3b80d8