Fix for issue 1775: in ldapquery, validation out of bounds query should be case insensitive as ldap is.

[germanparente]

Any compare operation in ldap should be case insensitive.

This is to fix a well known issue in oc groups sync command that is comparing base dn to a dn and showing out of bounds if the compare operation fails.

[germanparente]

/assign

[dusk125]

@germanparente can you add a test case please?

[germanparente]

I will do. Thanks for reviewing

[dusk125]

I validated that the added test fails without the fix, and with the fix, it passes
/lgtm
Passing to @deads2k for final review

[openshift-ci]

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This pull-request has been approved by: dusk125, germanparente
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[openshift-ci]

@germanparente: all tests passed!

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