Fix upgrade script and make parity run when no .parity dir.

[gavofyork]

No description provided.

[General-Beck]

check first run on clean install
ERROR: Error upgrading parity data: CannotLockVersionFile
workaround: run mkdir -p ~/.parity before running parity

[tomusdrw]

Wrapping std::io::Error in those errors could help debugging potential problems.

[General-Beck]

First run
Apr 14 22:48:45 localhost ubuntu-core-launcher[2912]: ERROR: Error upgrading parity data: CannotCreateConfigPath

Apr 14 22:48:45 localhost kernel: [ 720.307940] audit: type=1400 audit(1460674125.038:72): apparmor="DENIED" operation="mkdir" profile="parity.sideload_parity_IRKcLLeOIDVJ" name="/root/.parity/" pid=2912 comm="parity" requested_mask="c" denied_mask="c" fsuid=0 ouid=0

#set data dir`
PARITY_HOME=${SNAP_APP_DATA_PATH}
export PARITY_HOME
#check first run - create data dir
$verbose && echo "parity home:" $PARITY_HOME
mkdir -p $PARITY_HOME/.parity

start parity daemon

exec ${SNAP_APP_PATH}/bin/$plat_abi/parity -d "$PARITY_HOME/.parity"

Need to add a condition that checks to see if the --db-path

[gavofyork]

actually, it's not clear what the path should be for this version config file.

[NikVolf]

should also add --keys-path $PARITY_HOME/.parity/keys

[General-Beck]

and --password $PARITY_HOME/.parity/pass