In the example config and the jenkins scripts, use paths below common parent
dir /var/tmp/osmo-gsm-tester.
1. example: put the state dir in /var/tmp/osmo-gsm-tester/state, instead of in
the config dir like /etc/osmo-gsm-tester.
2. contrib scripts: place trials in /var/tmp/osmo-gsm-tester/trials, and to
move into place atomically, use /var/tmp/osmo-gsm-tester/.prep-trials as
temporary location.
The OsmoGSMTester manual is currently also being updated to setup these paths,
with /var/tmp/osmo-gsm-tester owned by a common group and having group-sticky
as well has group-writable access rules.
Change-Id: I2961e9d1d9b14859b886058b54ffcb36f4d88bc1