test/AxisMr: Handle motor 7.09

Add a slight workaround for a floating point problem:
Even if `caget IOC:m1.VERS` gives 7.09,
the python code gets a value slightly above 7.09,
making the comparison " <= 7.09" fail.
Solution:
use 7.091 instead of 7.09

test/pytests36/AxisMr.py

@@ -43,7 +43,8 @@ def __init__(self, axisCom, url_string=None):
             # Dummy read to give the IOC time to start
             try:
                 vers = float(self.axisCom.get(".VERS"))
-                if vers >= 6.94 and vers <= 7.09:
+                # 7.09 is rounded to 7.0900001xxx; use 7.091
+                if vers >= 6.94 and vers <= 7.091:
                     self.hasFieldSPAM = True
                     self.isMotorMasterAxis = False
                 else: