Werk #15312: mk_oracle: use "${GREP}" instead of "grep"

Component	Checks & agents
Title	mk_oracle: use "${GREP}" instead of "grep"
Date	Nov 27, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p16 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

When executed on solaris, "grep" does not know -x or -F. "${GREP}" points to a version of grep that understands those options.

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