auto-t: fix blacklist test ranking

The scan ranking logic was previously changed to be based off a
theoretical calculated data rate rather than signal strength.
For HT/VHT networks there are many data points that can be used
for this calculation, but non HT/VHT networks are estimated based
on a simple table mapping signal strengths to data rates.

This table starts at a signal strength of -65 dBm and decreases from
there, meaning any signal strengths greater than -65 dBm will end up
getting the same ranking. This poses a problem for 3/4 blacklisting
tests as they set signal strengths ranging from -20 to -40 dBm.
IWD will then autoconnect to whatever network popped up first, which
may not be the expected network.

To fix this the signal strengths were changed to much lower values
which ensures IWD picks the expected network.

autotests/testBSSBlacklist/bad_pass_test.py

@@ -32,12 +32,12 @@ class Test(unittest.TestCase):
         rule1 = hwsim.rules.create()
         rule1.source = bss_radio[1].addresses[0]
         rule1.bidirectional = True
-        rule1.signal = -3000
+        rule1.signal = -7000
 
         rule2 = hwsim.rules.create()
         rule2.source = bss_radio[2].addresses[0]
         rule2.bidirectional = True
-        rule2.signal = -4000
+        rule2.signal = -8000
 
         wd = IWD(True)
 

autotests/testBSSBlacklist/connection_test.py

@@ -34,12 +34,12 @@ class Test(unittest.TestCase):
         rule1 = hwsim.rules.create()
         rule1.source = bss_radio[1].addresses[0]
         rule1.bidirectional = True
-        rule1.signal = -3000
+        rule1.signal = -7000
 
         rule2 = hwsim.rules.create()
         rule2.source = bss_radio[2].addresses[0]
         rule2.bidirectional = True
-        rule2.signal = -4000
+        rule2.signal = -8000
 
         wd = IWD(True)
 

autotests/testBSSBlacklist/temp_blacklist_test.py

@@ -32,7 +32,7 @@ class Test(unittest.TestCase):
         rule1 = hwsim.rules.create()
         rule1.source = bss_radio[1].addresses[0]
         rule1.bidirectional = True
-        rule1.signal = -2500
+        rule1.signal = -7000
 
         rule2 = hwsim.rules.create()
         rule2.source = bss_radio[2].addresses[0]