memprof: set default path to profiling output file #630

Job	Run time
test-tarantool-integration / tarantool / build	5m 51s
test-tarantool-integration / expirationd / run_tests	3m 14s
test-tarantool-integration / avro-schema / run_tests	8s
test-tarantool-integration / metrics / run_tests	1m 21s
test-tarantool-integration / smtp / run_tests	7s
test-tarantool-integration / checks / run_tests	51s
test-tarantool-integration / memcached / run_tests	1m 22s
test-tarantool-integration / queue / run_tests	2m 48s
test-tarantool-integration / vshard / run_tests	7m 6s
test-tarantool-integration / tarantool-python / run_tests	2m 57s
test-tarantool-integration / crud / run_tests	13m 48s
test-tarantool-integration / ddl / run_tests	58s
test-tarantool-integration / etcd-client / run_tests (v3.4.30)	6m 21s
test-tarantool-integration / etcd-client / run_tests (v3.5.12)	6m 10s
test-tarantool-integration / mysql / run_tests	1m 1s
test-tarantool-integration / php-client / run_tests	54s
test-tarantool-integration / tarantool-c / run_tests	40s
test-tarantool-integration / go-tarantool / run_tests	2m 23s
test-tarantool-integration / php-queue / run_tests	1m 27s
	59m 27s

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