scripts/augeas/gen-nutupsconf-aug.py.in: fix ResourceWarnings about unclosed file descriptors [networkupstools#3256]

Signed-off-by: Jim Klimov <jimklimov+nut@gmail.com>

Author: jimklimov

scripts/augeas/gen-nutupsconf-aug.py.in

@@ -141,9 +141,11 @@ if __name__ == '__main__':
 								defRow = re.findall(r'"([^"]*)",?', varDefine)
 								if (len(defRow) == 1):
 									variableNames.append(defRow[0])
+							defFd.close()
 					else:
 						# Remove quotes
 						variableNames.append(row[1].replace('"', '').lstrip())
+			fd.close()
 
 	# Filter multiply defined variables
 	variableNames = sortUnique(variableNames)
@@ -160,6 +162,7 @@ if __name__ == '__main__':
 
 	# 2.1/ Search for the pattern to replace
 	outputText = tplFd.read()
+	tplFd.close()
 	outputText = outputText.replace('@SPECIFIC_DRV_VARS@', specificVars)
 
 	# 3/ Output final lens
@@ -168,3 +171,4 @@ if __name__ == '__main__':
 	else:
 		outFd = open(outputFilename, mode='w', encoding='utf-8')
 	outFd.write(outputText)
+	outFd.close()