filter out unmounted device items
filter out unmounted device items

bpramod/azure-linux-extensions,bpramod/azure-linux-extensions,andyliuliming/azure-linux-extensions,Azure/azure-linux-extensions,bpramod/azure-linux-extensions,vityagi/azure-linux-extensions,bpramod/azure-linux-extensions,vityagi/azure-linux-extensions,andyliuliming/azure-linux-extensions,Azure/azure-linux-extensions,bpramod/azure-linux-extensions,Azure/azure-linux-extensions,vityagi/azure-linux-extensions,andyliuliming/azure-linux-extensions,Azure/azure-linux-extensions,vityagi/azure-linux-extensions,vityagi/azure-linux-extensions,bpramod/azure-linux-extensions,Azure/azure-linux-extensions,bpramod/azure-linux-extensions,andyliuliming/azure-linux-extensions,vityagi/azure-linux-extensions,Azure/azure-linux-extensions,vityagi/azure-linux-extensions,Azure/azure-linux-extensions