Various autotest_regression fixes

#### autotest_regression: Too few arguments for format string

Fix TypeError: not enough arguments for format string
Found by PyCharm inspection.

#### autotest_regression: replace error.ValueError with ValueError

I think we mean ValueError here, I couldn't find any error.ValueError.

#### autotest_regression: move copy of install-autotest-server*log outside try/except

We need the install log file to debug any error, so move it outside the
try/except, otherwise any errors will trigger aexpect.ShellCmdError and
skip the copy