OCSP HTTP: Restore API of undocumented and recently deprecated functions

Restore parameters of OCSP_REQ_CTX_new(), OCSP_REQ_CTX_http(), OCSP_REQ_CTX_i2d().
Fix a bug (wrong HTTP method s

OCSP HTTP: Restore API of undocumented and recently deprecated functions

Restore parameters of OCSP_REQ_CTX_new(), OCSP_REQ_CTX_http(), OCSP_REQ_CTX_i2d().
Fix a bug (wrong HTTP method selected on req == NULL in OCSP_sendreq_new().
Minor further fixes in OSSL_HTTP_REQ_CTX.pod

Fixes #13873

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13898)

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OSSL_HTTP_REQ_CTX.pod: minor addition and remove redundant paragraph

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13898)

OSSL_HTTP_REQ_CTX_new(): replace method_GET parameter by method_POST

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13898)

rename OSSL_HTTP_REQ_CTX_header to OSSL_HTTP_REQ_CTX_set_request_line

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13898)

Deprecate OCSP_xxx API for OSSL_HTTP_xxx

Deprecations made:
OCSP_REQ_CTX typedef->OSSL_HTTP_REQ_CTX
OCSP_REQ_CTX_new->OSSL_HTTP_REQ_CTX_new
OCSP_REQ_CTX_free->OSSL_HT

Deprecate OCSP_xxx API for OSSL_HTTP_xxx

Deprecations made:
OCSP_REQ_CTX typedef->OSSL_HTTP_REQ_CTX
OCSP_REQ_CTX_new->OSSL_HTTP_REQ_CTX_new
OCSP_REQ_CTX_free->OSSL_HTTP_REQ_CTX_free
OCSP_REQ_CTX_http-> OSSL_HTTP_REQ_CTX_header
OCSP_REQ_CTX_add1_header->OSSL_HTTP_REQ_CTX_add1_header
OCSP_REQ_CTX_i2d->OSSL_HTTP_REQ_CTX_i2d
OCSP_REQ_CTX_get0_mem_bio->OSSL_HTTP_REQ_CTX_get0_mem_bio
OCSP_set_max_response_length->OSSL_HTTP_REQ_CTX_set_max_response_length
OCSP_REQ_CTX_nbio_d2i->OSSL_HTTP_REQ_CTX_sendreq_d2i
OCSP_REQ_CTX_nbio->OSSL_HTTP_REQ_CTX_nbio

Made some editorial changes to man3/OCSP_sendreq.pod; move the NOTES
text inline. Some of the original functions had no documentation:
OCSP_REQ_CTX_new, OCSP_REQ_CTX_http, OCSP_REQ_CTX_get0_mem_bio,
OCSP_REQ_CTX_nbio_d2i, and OCSP_REQ_CTX_nbio. Their new counterparts
are now documented in doc/man3/OSSL_HTTP_REQ_CTX.pod

Fixes #12234

Co-authored-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13742)

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