Fix init script syntax for compatibility with RHEL/CentOS 5

[legal90]

There is bash v3.2.* in RHEL/CentOS 5, which doesn't support this notation for stderr and stdout redirection: &>>

The following error occurs:

Starting vault: bash: -c: line 0: syntax error near unexpected token `>'
bash: -c: line 0: `ulimit -S -c 0 >/dev/null 2>&1 ;  { /opt/vault/0.6.1/vault server -config=/etc/vault/vault.json &>> /var/log/vault.log & } ; echo $! >| /var/run/vault.pid '
                                                           [FAILED]

So, we have to use the traditional notation with 2>&1 to keep the compatibility with RHEL/CentOS 5

[lock]

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