tests: Added GTests for base/str.cc

Adding these tests supercedes the unittest/strnumtest.cc
and unittest/tokentest.cc tests. They have thereby been removed.

Function "to_number" in base/str.hh previously failed to cast negative
float/double numbers. This was due to the use of
std::numeric_limits<T>::min() instead of std::numeric_limits<T>::lowest()
to determine whether a string-to-float/double conversion was
"Out of range". Tests "StrTest.ToNumberFloatNegative" and
"StrTest.ToNumberDoubleNegative" exposed this bug. It has been fixed.

Methods "split_first" and "split_last" in base/str.hh have had their
documentation updated to remove abiguity in their functionality.

Change-Id: I16e0fe40d884e22dd010db4045857eb6e7f33d4a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22084
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/unittest/SConscript

@@ -35,10 +35,8 @@ Source('unittest.cc')
 UnitTest('cprintftime', 'cprintftime.cc')
 UnitTest('nmtest', 'nmtest.cc')
 UnitTest('refcnttest', 'refcnttest.cc')
-UnitTest('strnumtest', 'strnumtest.cc')
 
 stattest_py = PySource('m5', 'stattestmain.py', tags='stattest')
 UnitTest('stattest', 'stattest.cc', with_tag('stattest'), main=True)
 
 UnitTest('symtest', 'symtest.cc')
-UnitTest('tokentest', 'tokentest.cc')