rcg epics IOC/sequencer expects /opt/rtcds/<site>/<ifo>/chans/tmp

Something should make this directory if it doesn't exist.

From epics startup:

Oct 10 11:52:08 eve1 rts_epics_exec[21678]: sevr=info Sequencer release 2.2.3, compiled Fri Jun  9 18:01:32 2017
Oct 10 11:52:08 eve1 rts_epics_exec[21678]: sevr=info Spawning sequencer program "x1iopv", thread 0x6808f50: "x1iopv"
Oct 10 11:52:09 eve1 rts_epics_exec[21678]: cp: cannot create regular file ‘/opt/rtcds/tst/x1/chans/tmp/X1IOPV.txt’: No such file or directory
Oct 10 11:52:10 eve1 rts_epics_exec[21678]: sh: 1: cannot create /opt/rtcds/tst/x1/chans/tmp/X1IOPV.diff: Directory nonexistent
Oct 10 11:52:10 eve1 rts_epics_exec[21678]: Error: Can't stat input file `/opt/rtcds/tst/x1/chans/tmp/X1IOPV.txt'