Different vendors return different datatypes for IfName / SysDesc / Alias

[road-cycling]

• http://cric.grenoble.cnrs.fr/Administrateurs/Outils/MIBS/?oid=1.3.6.1.2.1.31.1.1.1.1 (DisplayString)
• https://apps.juniper.net/mib-explorer/search.jsp#object=ifname&product=Junos%20OS&release=19.3R1 (OCTET STRING)

This is causing encode/decode issues when type is assumed. To fix this interface plugins will check the type of the returned value and handle accordingly.

if isinstance(<>, bytes):
       return <>.decode(u'ascii', u'ignore')
return <>