[ssd_generic] Fix innodisk health regex (sonic-net#287)

Description
The heath metric in ssd_generic for innodisk SSDs is too lazy. Fix to match the entire health number rather than just the first digit.

How Has This Been Tested?
Manual testing on Mellanox MSN2100

sonic_platform_base/sonic_ssd/ssd_generic.py

@@ -113,7 +113,7 @@ def parse_generic_ssd_info(self):
 
     def parse_innodisk_info(self):
         if self.vendor_ssd_info:
-            self.health = self._parse_re('Health:\s*(.+?)%?', self.vendor_ssd_info)
+            self.health = self._parse_re('Health:\s*(.+?)%', self.vendor_ssd_info)
             self.temperature = self._parse_re('Temperature\s*\[\s*(.+?)\]', self.vendor_ssd_info)
         else:
             if self.health == NOT_AVAILABLE:

tests/ssd_generic_test.py

@@ -235,7 +235,7 @@
 Model Name: InnoDisk Corp. - mSATA 3ME              
 FW Version: S140714 
 Serial Number: 20171126AAAA11730156
-Health: 0.00 
+Health: 82.34% 
 Capacity: 29.818199 GB
 P/E Cycle: 3000 
 Lifespan : 0 (Years : 0 Months : 0 Days : 0) 
@@ -397,7 +397,7 @@ def test_Innodisk_ssd(self):
 
         Innodisk_ssd.vendor_ssd_info = output_Innodisk_vendor_info
         Innodisk_ssd.parse_vendor_ssd_info('InnoDisk')
-        assert(Innodisk_ssd.get_health() == '0')
+        assert(Innodisk_ssd.get_health() == '82.34')
         assert(Innodisk_ssd.get_model() == 'InnoDisk Corp. - mSATA 3ME')
         assert(Innodisk_ssd.get_firmware() == "S140714")
         assert(Innodisk_ssd.get_temperature() == '0')