Description of problem:
Attaching an answer file to 'hosted-engine --deploy --config-append=<path>' does not work when the <path> starts with '~/'


Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
run hosted-engine --deploy --config-append=<path that starts with ~/>

i.e: run hosted-engine --deploy --config-append=~/answers.conf


Actual results:
answerfile was not found

Expected results:
answer file should be found and read


Additional info:
[root@host1 ~]# hosted-engine --deploy --config-append=~/hosted-engine-answers.conf 
[ INFO  ] Stage: Initializing
[ INFO  ] Generating a temporary VNC password.
[ INFO  ] Stage: Environment setup
          During customization use CTRL-D to abort.
          Continuing will configure this host for serving as hypervisor and create a VM where you have to install the engine afterwards.
          Are you sure you want to continue? (Yes, No)[Yes]: 
          It has been detected that this program is executed through an SSH connection without using screen.
          Continuing with the installation may lead to broken installation if the network connection fails.
          It is highly recommended to abort the installation and run it inside a screen session using command "screen".
          Do you want to continue anyway? (Yes, No)[No]: yes
[ INFO  ] Hardware supports virtualization
          Configuration files: []
[WARNING] The following configuration files are missing: ~/hosted-engine-answers.conf.
          Log file: /var/log/ovirt-hosted-engine-setup/ovirt-hosted-engine-setup-20171228041706-mpmd38.log
          Version: otopi-1.7.6_master (otopi-1.7.6-0.0.master.20171204131110.gitd5016f6.el7.centos)
[ INFO  ] Detecting available oVirt engine appliances
[ INFO  ] Stage: Environment packages setup
[ INFO  ] Stage: Programs detection
[ INFO  ] Stage: Environment setup