Add tests for spurious certs in the chain

We have code to skip them but didn't have explicit tests ensuring they are
(the corresponding branch was never taken).

While at it, remove extra copy of the chain in server10*.crt, which was
duplicated for no reason.

tests/data_files/Readme-x509.txt

@@ -74,10 +74,12 @@ List of certificates:
 - server7*.crt: I1 E L P1*: EC signed by RSA signed by EC
     *P1 except 7.crt, P2 _int-ca_ca2.crt
     *_space: with PEM error(s)
+    _spurious: has spurious cert in its chain (S7 + I2 + I1)
 - server8*.crt: I2 R L: RSA signed by EC signed by RSA (P1 for _int-ca2)
 - server9*.crt: 1 R C* L P1*: signed using RSASSA-PSS
     *CRL for: 9.crt, -badsign, -with-ca (P1)
 - server10*.crt: I3 E L P2/P3
+    _spurious: S10 + I3 + I1(spurious) + I2
 
 Certificate revocation lists
 ----------------------------

tests/data_files/server10_int3_int-ca2.crt

@@ -9,46 +9,6 @@ rg8VxEbCgVv8iH+kOIEn9MjhpvKzvwUoV+6rjQIgZU/RXAyc1a+H2+soGfNEIOBQ
 AzO3pJx7WJAApZuBX1Q=
 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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tests/data_files/server10_int3_int-ca2_ca.crt

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 -----END CERTIFICATE-----
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------END CERTIFICATE-----
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tests/data_files/server10_int3_spurious_int-ca2.crt

@@ -0,0 +1,64 @@
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tests/data_files/server7_spurious_int-ca.crt

@@ -0,0 +1,65 @@
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/suites/test_suite_x509parse.data

@@ -747,6 +747,14 @@ X509 Certificate verification #87 (Expired CA and invalid CA)
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SHA1_C:MBEDTLS_SHA256_C
 x509_verify:"data_files/server5.crt":"data_files/test-ca2_cat-past-invalid.crt":"data_files/crl-ec-sha1.pem":"NULL":MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:MBEDTLS_X509_BADCERT_EXPIRED:"compat":"NULL"
 
+X509 Certificate verification #88 (Spurious cert in the chain)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SHA1_C:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+x509_verify:"data_files/server7_spurious_int-ca.crt":"data_files/test-ca2.crt":"data_files/crl-ec-sha1.pem":"NULL":0:0:"compat":"NULL"
+
+X509 Certificate verification #89 (Spurious cert later in the chain)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SHA1_C:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+x509_verify:"data_files/server10_int3_spurious_int-ca2.crt":"data_files/test-ca.crt":"data_files/crl-ec-sha1.pem":"NULL":0:0:"compat":"NULL"
+
 X509 Certificate verification callback: trusted EE cert
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_SHA256_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
 x509_verify_callback:"data_files/server5-selfsigned.crt":"data_files/server5-selfsigned.crt":0:"depth 0 - serial 53\:A2\:CB\:4B\:12\:4E\:AD\:83\:7D\:A8\:94\:B2 - subject CN=selfsigned, OU=testing, O=PolarSSL, C=NL\n"