Description of problem:
Can't input password for encrypted partition of physical machine's os during virt-p2v conversion

Version-Release number of selected component (if applicable):
virt-p2v-1.36.10-1.el7.iso
virt-v2v-1.36.10-1.el7.x86_64
libguestfs-1.36.10-1.el7.x86_64
libvirt-3.8.0-1.el7.x86_64
qemu-kvm-rhev-2.10.0-3.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Install a linux OS on physical machine, need to set password for partitions during installing OS
2.Boot the machine into virt-p2v client after finishing OS installation
3.Input the conversion info at p2v client and convent host to libvirt
4.Then the conversion will stop at inputting the password for encrypted partition but p2v client has no response with inputting characters, pls refer to screenshot

Actual results:
As above description

Expected results:
Virt-p2v can convert the host whose OS has encrypted partition

Additional info: