[analyzer] SATestBuild: strip trailing newlines from command file.

When running a make-based command, SATestBuild tries to append a -jN flag
with an appropriate N to run the build in parallel. However, it failed
to take into account that each line read includes a trailing newline
(unless it is the last line of a file without a trailing newline), which
resulted in the "-jN" appearing on a line on its own.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190164 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused method Job::AddCommand.

I was going to update the comment referring to PipedJob, which was removed
some time ago, but then it turned out that this method is not actually used
at all.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190171 91177308-0d34-0410-b5e6-96231b3b80d8