Tools: Fix a race condition on the regression tests on Windows

Added \r\n to the expect() string as recomended at:
http://pexpect.readthedocs.io/en/stable/overview.html#find-the-end-of-line-cr-lf-conventions
this should work on both windows and linux systems

pexpect says it will always do a minimal (non greedy) matching and docs explicitly say that a .+ expression will always return only one character. These lines in autotest are looking for \S+, which, believing the documentation, would only return one character of the log file path.
Now we know that's not true, neither for Linux or for Windows (given the logs from @karthikdesai), so I can only assume that it does a greedy match but only for the characters it has received at the time expect is called.
Apparently, in the machines we are using autotest, it isn't a problem since MAVProxy is likely fast to give its output to pexpect before the expect method is called. On @karthikdesai's machine that wasn't happening since his machine was more or less loaded.
Concluding, this looks like a correct fix in the sense that it extends the regex pattern to wait for the end of line (and probably other places could benefit from it too).

Tools/autotest/apmrover2.py

@@ -239,7 +239,7 @@ def drive_APMrover2(binary, viewerip=None, use_map=False, valgrind=False, gdb=Fa
 
     sitl = util.start_SITL(binary, model='rover', home=home, speedup=speedup, valgrind=valgrind, gdb=gdb, gdbserver=gdbserver)
     mavproxy = util.start_MAVProxy_SITL('APMrover2', options=options)
-    mavproxy.expect('Telemetry log: (\S+)')
+    mavproxy.expect('Telemetry log: (\S+)\r\n')
     logfile = mavproxy.match.group(1)
     progress("LOGFILE %s" % logfile)
 

Tools/autotest/arducopter.py

@@ -1004,7 +1004,7 @@ def fly_ArduCopter(binary, viewerip=None, use_map=False, valgrind=False, gdb=Fal
     if use_map:
         options += ' --map'
     mavproxy = util.start_MAVProxy_SITL('ArduCopter', options=options)
-    mavproxy.expect('Telemetry log: (\S+)')
+    mavproxy.expect('Telemetry log: (\S+)\r\n')
     logfile = mavproxy.match.group(1)
     progress("LOGFILE %s" % logfile)
 
@@ -1357,7 +1357,7 @@ def fly_CopterAVC(binary, viewerip=None, use_map=False, valgrind=False, gdb=Fals
     if use_map:
         options += ' --map'
     mavproxy = util.start_MAVProxy_SITL('ArduCopter', options=options)
-    mavproxy.expect('Telemetry log: (\S+)')
+    mavproxy.expect('Telemetry log: (\S+)\r\n')
     logfile = mavproxy.match.group(1)
     progress("LOGFILE %s" % logfile)
 

Tools/autotest/arduplane.py

@@ -456,7 +456,7 @@ def fly_ArduPlane(binary, viewerip=None, use_map=False, valgrind=False, gdb=Fals
                           valgrind=valgrind, gdb=gdb, gdbserver=gdbserver,
                           defaults_file=os.path.join(testdir, 'default_params/plane-jsbsim.parm'))
     mavproxy = util.start_MAVProxy_SITL('ArduPlane', options=options)
-    mavproxy.expect('Telemetry log: (\S+)')
+    mavproxy.expect('Telemetry log: (\S+)\r\n')
     logfile = mavproxy.match.group(1)
     progress("LOGFILE %s" % logfile)
 

Tools/autotest/ardusub.py

@@ -125,7 +125,7 @@ def dive_ArduSub(binary, viewerip=None, use_map=False, valgrind=False, gdb=False
 
     sitl = util.start_SITL(binary, model='vectored', home=home, speedup=speedup, valgrind=valgrind, gdb=gdb, gdbserver=gdbserver)
     mavproxy = util.start_MAVProxy_SITL('ArduSub', options=options)
-    mavproxy.expect('Telemetry log: (\S+)')
+    mavproxy.expect('Telemetry log: (\S+)\r\n')
     logfile = mavproxy.match.group(1)
     progress("LOGFILE %s" % logfile)