[aorai] use WP cache in 'prove' ptest configuration

src/plugins/aorai/tests/wp-cache/cache/2ac1425ad28661eb2837bf563c0bf0ac.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/2c2e7efc1d3030db432a7305b25ea637.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/2c9e3dc5484c0bfbc11de2d3bb359c59.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0072,
+  "steps": 26 }

src/plugins/aorai/tests/wp-cache/cache/2e42c1f5f0328698a4f06d4994e51bb2.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0426,
+  "steps": 62 }

src/plugins/aorai/tests/wp-cache/cache/2f4dfa2b2933bb22b61054fb15ef7cd2.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/3017f292913ccb1045c8cae77027767d.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0282,
+  "steps": 98 }

src/plugins/aorai/tests/wp-cache/cache/3060f1c3a5b1f29bf17ceaefcde1d8dd.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0086,
+  "steps": 32 }

src/plugins/aorai/tests/wp-cache/cache/32482610491ef5a8203b94e6ce48ee00.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0223,
+  "steps": 196 }

src/plugins/aorai/tests/wp-cache/cache/32888dd3e43ec36db6eadf188c7a2193.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0079,
+  "steps": 32 }

src/plugins/aorai/tests/wp-cache/cache/32adbc54a70ff604368ed52502a4135c.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0071,
+  "steps": 10 }

src/plugins/aorai/tests/wp-cache/cache/32c5e7d9a33f6b4c9c306bc4fbfc0f1a.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/32e87e007513835e4e59df36a11c34bd.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/33eaff63c3e6380522e9afa784bcc69e.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/35877d956185d12b3775531e2241c096.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0087,
+  "steps": 51 }

src/plugins/aorai/tests/wp-cache/cache/35b8a60f6c61a8aa4f2690ad495f9848.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0056,
+  "steps": 36 }

src/plugins/aorai/tests/wp-cache/cache/37ad2de0cf39806873bd0d63ce21f625.json

+{ "prover": "Alt-Ergo:2.4.1", "verdict": "failed" }

src/plugins/aorai/tests/wp-cache/cache/394d8ffc087737c2d96315d5a3c84dcf.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0095,
+  "steps": 38 }

src/plugins/aorai/tests/wp-cache/cache/3b3ae646593d57ec18b5d784e74496da.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0073,
+  "steps": 32 }

src/plugins/aorai/tests/wp-cache/cache/3b9893008f012d957e56672950693269.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0239,
+  "steps": 249 }

src/plugins/aorai/tests/wp-cache/cache/3d37ec0ab64619400afa39321d35f806.json

+{ "prover": "Alt-Ergo:2.2.0", "verdict": "valid", "time": 0.0142,
+  "steps": 74 }