swtpm-wrappers: simplify using swtpm-native

Native tools exist in recipe specific sysroots and are normally
not meant to be called from outside a build. But that's what we
need to do when using swtpm-native together with qemu, so these
wrappers make that possible by setting up the necessary environment
and hiding the internal paths.

Invoking swtpm_setup.sh gets some special support: swtpm_setup.sh runs
two daemons, tcsd and swtpm, of which tcsd insists on running as root
or tss. In practice, running as the normal user is perfectly
fine. Instead of patching the upstream source code, the approach take
here is to run under pseudo.

Usage examples:

$ bitbake swtpm-wrappers
$ mkdir -p my-machine/myvtpm0
$ tmp-glibc/work/x86_64-linux/swtpm-wrappers/1.0-r0/swtpm_setup_oe.sh --tpm-state my-machine/myvtpm0
Starting vTPM manufacturing as root:root @ Mon 16 Jan 2017 04:09:21 PM CET
TPM is listening on TCP port 55675.
-rw------- 1 root root 65 Jan 16 16:09 /tmp/tmp.2yJBKTTwRk
Ending vTPM manufacturing @ Mon 16 Jan 2017 04:09:21 PM CET

The resulting "my-machine/myvtpm0" can then be used with swtpm (this
time, it really has to be running as root because it uses CUSE to
create /dev/vtpm0, and an absolute path is needed for the tpm state
dir) and qemu-tpm (patches not currently in OE-core, have to be
applied manually):

$ sudo tmp-glibc/work/x86_64-linux/swtpm-wrappers/1.0-r0/swtpm_cuse_oe.sh -n vtpm0 --tpmstate dir=`pwd`/my-machine/myvtpm0
$ sudo chmod a+rw /dev/vtpm0
$ runqemu ... 'qemuparams=-tpmdev cuse-tpm,id=tpm0,path=/dev/vtpm0 -device tpm-tis,tpmdev=tpm0'

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

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