Mark the async_key_value_source constructor noexcept

It cannot throw an exception anyway and this calms down code inspection
when creating a static instance

Author: gnosek

userspace/async/async_key_value_source.h

@@ -98,7 +98,7 @@ class async_key_value_source
 	 *                        value will live before being considered
 	 *                        "too old" and being pruned.
 	 */
-	async_key_value_source(uint64_t max_wait_ms, uint64_t ttl_ms);
+	async_key_value_source(uint64_t max_wait_ms, uint64_t ttl_ms) noexcept;
 
 	async_key_value_source(const async_key_value_source&) = delete;
 	async_key_value_source(async_key_value_source&&) = delete;

userspace/async/async_key_value_source.tpp

@@ -32,7 +32,7 @@ namespace sysdig
 template<typename key_type, typename value_type>
 async_key_value_source<key_type, value_type>::async_key_value_source(
 		const uint64_t max_wait_ms,
-		const uint64_t ttl_ms):
+		const uint64_t ttl_ms) noexcept:
 	m_max_wait_ms(max_wait_ms),
 	m_ttl_ms(ttl_ms),
 	m_thread(),