implemented steps for voicemail dissociation
make call log generation longer

reason: we need to run the generation twice in parallel, but sometimes
it is not run in parallel so we make it longer.
remove duplicate '/'
remove duplicate '/' from path
add step for setting HTTP_PROXY
Merge branch '4738_http_proxy'
update post_install feature for wheezy
add test for line secret from user csv import
Merge branch '4755_cannot_set_sip_line_secret'
test content of conf file after adding a sip|iax trunk
Merge branch '4689_dissociate_user_voicemail'
add missing step for scenario in RESTAPI/users
move utf8 decode to helper
Merge branch 'test-trunk-iax'
Merge branch 'edit_user_with_voicemail'
start implementing test for variable substitution in sheets
finish test for substituted variables in sheets
add user_line test
add missing asset file
fix wrong variable name