ci/deploy.sh: Add new `-E` arg for env erase

ci/deploy.sh: Add new `-E` arg for env erase

NOTE: In order to undefine VCP VMs with NVRAM (e.g. AArch64 VMs
using AAVMF), an additional parameter should be passed to libvirt
by Salt virt core module (equivalent to `virsh undefine --nvram`).

While at it, pass CI_DEBUG, ERASE_ENV enviroment variables to
state execution, and stop force-applying patches.

Also refactor the rsync between foundation node and Salt master,
so the whole git repo is copied as </root/opnfv>, and <root/fuel>
becomes a link to it; useful for Armband, where 'fuel' is a git
submodule. Fix .git paths after rsync, so git submodules work as
expected in cfg01 repos.

JIRA: FUEL-307

Change-Id: Ic62f03e786581c019168c50ccc50107238021d7f
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
(cherry picked from commit 77942178b3aff6adc83b5f83645acfff467fa76a)