Version 1.2.2-r1 (1.2.2.1)

Put a version to match @arut branch: 1.2.2. Revision 1.

Years passes by.

Many fixes for HLS, DASH, etc:

• dynamic module
• fix some compiler warnings
• send redirect via on_play
• drop all connections on reload
• support nginx 1.11+, tnx @RocFang
• fixes for notification code, tnx @chriswiggins
• single track, single audio, tnx @chriswiggins
• hls_allow_client_cache, tnx @benmcmeen
• MPEG-DASH manifest generation update by @ArhiChief
• record_started events, tnx @diegostamigni
• openssl-1.1 support, tnx @mbeacom
• HLS milliseconds accuracy, tnx @baxerus
• statistics page improvements, tnx @eutychus
• other fixes and typos: @RocFang, @heftig, @karlisk, @Stvad, @akotulu, @fserreau. @Gamec, @benwilber, @asticode, @AdrianDroid, @zotanmew, @micolous, @z411 and many other