[OpenWrt] Fix BusyBox ps unsupported flags#1621
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Command `ps ax | grep '<WORD1>|<WORD2>' | grep -v 'grep'` can be directly transformed to `IsRunning '<WORD1>' || IsRunning '<WORD2>'`. `IsRunning` supports BusyBox `ps` (without `-ax` option, see: <https://github.com/mirror/busybox/blob/master/procps/ps.c>).
BusyBox not implements flags `-ax` (see: <https://github.com/mirror/busybox/blob/master/procps/ps.c>) Calling it throws an error: `/bin/ps: unrecognized option: a`. `IsRunning` function cannot be used here due to complex searching rules.
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Errors
/bin/ps: unrecognized option: aand/bin/ps: unrecognized option: xblocks multiple tests.This is a part of enabling support for OpenWrt, see: #1600.
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