Support log file can be rotated hourly.

[maczam]

1. Support log file can be rotated hourly , filter add property hourly
2. Tag support method runtime.Caller

<filter enabled="true">
        <tag>testlog</tag>
        <type>file</type>
        <level>INFO</level>
        <property name="filename">/pdata1/log/testlog.%Y%M%D%H.log</property>
        <property name="format">%M</property>
        <property name="rotate">true</property>
        <property name="append">true</property>
        <property name="maxsize">100M</property>
        <property name="hourly">true</property>
        <property name="tar">false</property>
        <property name="maxindex">20</property>
    </filter>